The response has been generally positive from what I have seen and people seem genuinely supportive. Me? I think this idea sucks. Ozzy jumped the shark 15 - 20 years ago and I guarantee the new album will be a piece of crap and the tour will descend into Sabbath playing the same ten songs they always play with Ozzy.
You want proof? See this Ozzfest show from 1999. You think Ozzy is going sound any better with these guys 13 years later? Dream on.
Contrast that with the STELLAR Dio reunion and Iommi and crew should have just gone out on a high note.
Call me a curmudgeonly old fart but I dunno...