Myspace never had the sheer volume or global appeal of FB. I know it was big, but it was never completely integrated into everyone's life.
Compartmentalizing your life/people you know is an awesome idea, but just because it is intuitive to you or I doesn't mean it will be to the masses.
Also, I don't think Pavy is in the minority here. I mean even if Google+ is a superior product, what good is it if everyone you know isn't on it like they already are your FB/twitter/email accounts? Even if 85% of my contacts eventually get Google+, when I can have all 100% on the other, why bother?
I think many will hop on because its new and shiny, but even if it IS superior, the daunting task of building up an entire social network again strikes me as more burdensome than "fun and exciting". I'll do it, since I'm into this shit, but I'm willing to bet that many won't.