Originally Posted by BiggerJ
But that would result in Post-Movies Doc starting to fade away like Marty, since the fading of Marty has set Doc's past self from the hiring on an assistant onward on a new path. Fading Marty and Fading Doc could still set things right, which would cause Friendless Doc to fade away himself.
That could work, but it's probably better to keep things simple, with a brief sequence showing Better Life Biff and Doc's Assistant Tiff in an alternate world that isn't too bad but pisses off Marty ("Not on my goddamn watch!").
Ya, it was just an example. I could never pull of anything so complex.
Doc: Just imagine the effects on Biff's future!
(Marty imagines Biff depressed because he has no one to bully)
Marty: Eh, can't be that bad