Why will this be such a flop? Are you maybe exaggerating? If it is because of the fundamental changes you mention? Which ones in particular and how are they not proven to be better?
I'm not defending Windows8 at all. Like I said, I'm no Microsoft fan myself but even I can give them credit for some of the things they're doing in Windows8. I think it'd be far more constructive to give us some specifics so that we can have a real discussion rather than throwing out generalizations that'll turn this into another religious debate.