Wow, I hadn't even considered a situation like that Necro. That's awesome.
I think at Summerslam Morrison is going to turn on Team WWE and join Nexus. I think it'll be a great fit. There seems to be signs of a heel turn anyway... His squabbles with R-Truth, the growth of a beard (think CM Punk heel turn).
From there, I think Nexus needs to get some titles. The tag belts should be on two of them (I think Young and Gabriel would be cool). They should get the US belt too. I think if Morrison joined he'd be good with the US belt, taking it from Miz and then feuding with R-Truth with it.
I don't foresee HHH being a member, let alone the leader, of Nexus. I do think he'll return at SS, but I think it's going to be to go after Sheamus. I'm not sure how he'll factor into Nexus at all though, because obviously someone that big needs to be playing some role... Although, Orton's not playing much of a role against Nexus either.
Going back to the titles situation... I think Nexus needs to be about opportunity. Joining needs to mean more than just not getting jumped by them. It needs to mean that now you've got a legitimate shot at doing something with your career.
I also think Nexus is here to stay for a little while. They've made wristbands and t-shirts and have sold tons of them... You really think they're gonna just squash the angle by the end of this year? I think we're likely to see this riding all the way to Wrestlemania. I really hope so, anyway.