I would hate that. I would probably watch it one time, never watch it again, and never own it. It would be one thing if it were differant people from the beginning, but it's already bad enough that Victoria is played by a differant person (not that I don't like her, I'm a big fan). Switching actors at all just takes away from the magic of the movie. So if they changed THE ENTIRE CAST, it would ruin all the appeal of the movies for me.
I probably wouldnt go to the theater to watch it...I would just wait for it to come out on cable or dvd....but lets pray they dont do anything silly like that!
it depends on what characters were changed. if it were anyone who is major in the the movie(EX. wolfpack, cullen family, bella, charlie and so on) then no i would not watch it. other wise if it were minor changes like victorias change then i would watch it.