People only care about it being the original Sabbath because they can say it's the original Sabbath. Apart from Tony and Ozzy no one -actually- cares who's in the band. They just want to be able to say "I saw the original Sabbath," like it's some kind of achievement.
Personally, I don't care if they play with Bill or Vinny or Brian Tichy again, but if Bill is getting screwed, which he probably is, then good luck to him.
16/9 Richie Kotzen