One thing that I haven't heard yet is that Google+ is the worst name they could ever come up with!
"+"? Are you kidding me?
On the other hand: here is a feature that would help G+ to take of: Tight integration with Android (2.1 and above at least!!! not 3.1) with android video hangout over wifi and 3G for free(!) international! A tough move, I know, but without something on this scale, this could just be another wave.