That is all that I am suggesting is that they use these classic [i.e. KIRBY] comics as a blue print for the movies, not to do a word for word translation.
Sure, all these villains need to be fleshed out, but I do not need to dig deeper, the writers do. But there is clearly enough there to work with - the Whiplash connection with Stark was invented for the movie, the same can be done with the Wizard and co. The above motive was just something off the top of my head, but it easily could be developed into a situation where it cost the Wizard billions of dollars as well as his creditability - his motivation is not my point - ANYTHING can be used as an excuse for them to be going at each other - the three Spider-Man movies have shown that. The evil FF offer an interesting array of visual powers that would translate well onto screen; as do any number of the FF's villains; so let's use them!
I don't see how an man with a glue gun trying to defeat people who are far powerful then him an is interesting visual, that seems like a laughable visual. I think someone like Trapster doesn't work well screen and revamping him would be hard, in the comics he has lame gimmick, no motive and no real intestinal personality. So that leaves you with nothing. I don't find Trapster a believable threat in the comics, I don't see why the audience would find him compelling. I think Traster would only work if was a comic relief villain defeated at the beginning of the movie and never seen again.
It doesn't mean all the FF villains are instantly ready to carry a movie, not all villains are created equal, some make better choices then others. I think Annihilus is a way better villain then Wizard or Red Ghost, considering Annihilation. I never heard of Wizard or Red Ghost being the main villains in their own well received crossover. Heck the Ultimate frightful four are way better then the 616 Frightful Four, considering that they were zombie versions of the real FF, instead of team that includes a guy with a glue gun. The FF are supposed to be cosmic explorers, so stories where they fought what amounted to 4 street level villains were always tedious to me.
There is a problem when the motivation is just an excuse and doesn't seem natural, it makes the villain a boring character. Wizard losing billions and his credibility, why should I care? That means nothing to me, its not compelling at all. In the Spider-Man movies most of the villains had motives that made sympathetic or sinister.
Dr. Octopus was an effective Anti villain with motives that made him sympathetic, someone like the Joker is the opposite, his motives make him terrifying, Joker had no powers, but his nihilistic philosophy makes villain that the audience would find very compelling. What you describe for Wizard just comes off as pathetic in comparison, his motives make him either terrifying nor sympathetic. Even movie Whiplash was compelling, because his life was ruined by the actions of Tony's father and his very existence makes Tony question himself. Compared to all that, Wizard's motives as described here, seem pathetic, not the makings of an epic movie villain.
He just comes off as some whiny loser who can't take responsibility for his own flaws and frankly Wizard hating Reed because he pointed a mistake he made, makes him seem like a very pathetic Dr. Doom knock off, without the pathos and other the motivations that made Doom a stronger character.
This new motive doesn't make Wizard's personality any better, its still as one note as ever. He still has only one personality facet, arrogance. I think Wizard needs more personality facets then that to carry a movie.
All I am saying is mix it up a little. Don't give us the same bad guy every time. When Doom is brought back, bring him back right. Ignore any reference to the other films, do the whole European dictator, science/sorcery thing. Just don't do it in the next movie!
But that doesn't mean every FF villain can carry a whole movie, at least not without a giant revamp.