I love how more people think Wally West is the better character, yet think Barry should get an origin movie. Lets not do another run of the mill superhero origin movie, make this film stand out. Do a flick about the Flash Legacy and include Wally, Barry, and Jay. Basic plot outline. Wally West takes over the Flash mantle from the deceased Barry Allen, under the guidance of Jay Garrick.
With that plot, you get the most The Flash who has the most character depth and has been fleshed out the best, yet Barry Allen is still important to the story. And Jay Garrick is there and can provide The Flash Legacy aspect. It's a frigging win win all around. Whats great is, you can portray Barry Allen is this larger than life, perfect hero, and now Wally West has to follow that, the film can mirror the comics. That would make good cinema if done right, better cinema than yet another basic origin story. The Green Lantern storyline is complex enough that it needs to be shown from the start of it all, with Hal Jordan.
The movie can be called "The Flash: Legacy".
And in the sequel, you can go all GodFather Part 2, and show flashbacks of Barry Allen that mirror the present day Wally West, perhaps against the Rogues.