if i could put a DB movie together with no time or financial restrictions. here's what it would be like...
Distributor: Universal, Disney, or Sony
Produced by: Wachowski's (Matrix Trilogy) and Stephen Chow (Kung Fu Hustle)
Directed by: Brad Bird (the Incredibles)
Written by: Andrew Stanton (Finding Nemo)
Premise and Treatment: the movie's structure would be very similar to Superman (1978), except it wouldn't start on Goku's home planet of Vegeta. in fact, Goku's alien origins would be kept secret until the very end. there would be changes made, but they would only be made to ENFORCE Toriyama's ideas instead of shying away from them (like the current movie). instead of 'Dragon World' or 'Dragon Earth', the world would be known as Ariath (based on 'Aries' which basically is the Western astrological equivalent to the year of the Dragon) and would be pronounced "AW-ree-ath". Ariath would be a world full of cultures and creatures vastly different from our own. there would only be a few cities, but those cities would be booming metropolis's with technology that far surpasses our own. Ariath would be a world were space travel and intergalactic relations are on the brink of becoming a regularity. it wouldn't be uncommon to see aliens and strange beings talking to 'oomans' (Ariathling humans).
the movie would start off with Grandpa Gohan stumbling across Goku (wandering around aimlessly) in the woods on his way to a small village near his house. trying to befriend Goku, Gohan would give the orphaned boy some snacks and Goku would instantly eat them. Goku would still be hungry and demand more food and he would start attacking Gohan for not having anymore. Gohan would then have no choice but to use some sort of special move (not the kamehameha) to knock Goku unconscious (causing his amnesia). Gohan would then take the boy and claim him as his own. we would then see a montage of Gohan raising the boy and teaching him the ways of the natural world....along with martial arts. every now and they would visit that small village for food and essentials. he would also have a few friends in the village (explaining how Goku can get along so easily with other people despite being a recluse), one of who is a monk pupil with no nose.
Gohan would continue to raise Goku, but he would also notice how fast and strong he has grown in such a short time. eventually, Gohan would die from natural causes, but not before bestowing Goku with an orange ball of glass with 4 stars trapped inside saying "as long as this remains with you, then so shall i." mourning the loss of his 'grandpa', Goku decides that there's nothing left for him there so he decides to explore the world beyond what he's familiar with. his adventure is delayed when he mistakes a car for an animal and tries to kill it for dinner. the driver of the car turns out to be a prissy, but nerdy blur-haired, teenage girl named Bulma and she's looking for the Dragon Balls. later on, she tries to explain how Dragon Balls and the world works (saying that she doesn't know what she would wish for, but maybe an honest, loyal boyfriend) over a nice camp fire, but Goku is too busy chowing down on his monster fish to pay attention. Bulma then stops chattering when she sees a pillar of smoke in the distance, coming from the village that Goku and Gohan often visited.
they rush to the scene, but it's too late since most of the town's people have died. Goku's nose-less friend, Krillin, is luckily alive and reveals that a being named Pilaf raided the village in search for a powerful ornament. having just told Goku what would happen if all the balls were collected into one, Bulma decides to look for the other Dragon Balls before Pilaf can get to them. so Krillin decides to join the 2 as they set off to find the rest of the Dragon Balls.
Other thoughts and ideas: one of the biggest things the movie would push, is the responsibility for preserving and respecting nature. i was arguing that Goku not being a nature boy is a hugely missed opportunity because we could really use a hero that studies and preaches the importance of nature. we would see Goku genuinely enjoy being outdoors and sometimes meditating in front of beautiful, natural scenery. Goku would very much be the Goku we all know and love. the hungry, fun-loving fish out of water who will do anything to protect his family and friends.
the villain would be Lord Piccolo (no Piccolo Jr, but Lord Piccolo would have Jr's abilities and personality) who would hire Pilaf to collect the balls so that he can use them to wish for universal domination. Pilaf would be frightened in Piccolo's presence, but would be conjuring ways of betraying him in private (similar to Starscream). Goku would have his power poll up until he completes Roshi's training when Roshi tells him that he no longers needs the power poll with his skill level. Goku then gives the power poll to Roshi as a gift and Roshi uses it like a walking cane to fake being weak (Yoda). Krillin and Goku would have their tussles during Roshi's training. Roshi would still be a perv, but most of his antics would be shown in subtle ways (in the background, out of focus, etc). Yamcha would be a desert bandit who is more interested in Bulma than the Dragon Ball, but is too shy to confront her...so he would enter the tournament in an attempt to impress Bulma. the tournament would only allow one person from each 'school' or 'group' to participate so Krillin and Goku would have to battle each other to see who enters (Goku winning of course). Master Roshi would still enter as Jackie Chun, but would be revealed as Roshi when Lord Piccolo recognizes that Jackie Chun is fighting in a style that hasn't been used since Roshi fought Piccolo. at the end of Goku and Piccolo's fight, we get to see a glimpse of Goku in super Saiyan mode right before he beats Piccolo to a pulp. Piccolo then reveals that Goku is most likely a descendant of the alien race of Saiyans and is flown away by his minions. by the end of the film, Goku and co will have collected the 7 Dragon Balls and will have wished for all of Piccolo's destruction to be reversed.
the credits will end with one of the tournaments' fighters by the name of Nappa talking to a computer screen and saying that he has found 'the tainted one'.