I see what the problem is, and I would even try to look at it with a negative eye... but consider this.
The time for Disney to put the project in mothballs without losing a substantial amount of money has long passed. That was during the script writing phase... maybe initial locational scouting. Now, yes, there are horror stories of films being shot down out of production while they're being filmed, but those are pretty extreme cases. Disney is a well run entertainment company, and I feel they're smart enough to not screw up the movie in any aspect. There is the worry that they'd treat the movie like it didn't exist once it's filmed and hide the release date and fail to promote it, sure... but that would be completely Weinstine... err... stupid of them to do so. They've sunk a LOT of money into purchasing the property... they've actually done a pretty good job marketing them so far. Nothing they're doing since that shaky first year (and since everything depended on OZ, no wonder it was so shaky) says we have no plans to make this movie.
Pulling the plug now would be costly and stupid. Too many big big names have signed on to not raise a fuss or some eye brows if something were to go down on Disney's part. Plus, Jason IS a pretty big name in the industry now... HE came to them with the project and all. If they want him to do the voice of a hip hop dog in a few years, they better had keep him happy and get this project.
There's too much money to be made NOT to try to release a film. Sure, if something were to go down, and the movie weren't successful THEN is the time to worry about the future of the franchise... as for now, I agree... nothing short of WW3 will shut this movie down. And if North Korea screws anything up with the world until then, i'll personally go over their and strangle Eel-man myself.