Sonic 4 Silver and Amy theory

Theory:

If the movie is about Sonic and Amy trying to stop Metal Sonic from taking over the world in the future and they successfully change the future, what happens to that future? What if in the post-credit scene, it's revealed that Silver and Blaze are sent there after their timeline is pretty much deleted, and THAT'S their motive to be "villains." Sonic literally erased their entire timeline so it makes sense for them to be pretty angry.

This also fits in with how the movies don't really introduce more than 2 characters in each movie.