I think the question is what happens when new computers start shipping with Win8 on them. With Microsoft’s track record of about 50% of their OS’s sucking, Win8 might be another dog.
I suppose that same can be said about anything new, like a car, which is why I wait a bit before buying anything so I know(as you said) whether or not it is a “dog”. One could always buy a Mac and really, how many typical home users are going to setup a dual boot machine in the first place?