Alright, I know you guys aren't fans of fantasy booking, but whatever. Here's how I'd proceed from here.
Next week's RAW opens with Vince standing in the ring.
Vince: (calmly)"I know what everyone's been talking about all this past week, and I'd like to address it immediately. I ask that CM Punk please come down to the ring".
*Punk's music hits*
Vince: (calmly) "Cut his music, please; it's not necessary".
*Punk enters the ring with a shit-eating grin on his face, mouthing barely audibly "What're you gonna do, Vince? Huh?" etc. etc..
Vince: (again, calmly. This isn't the loud-mouthed VKM everyone's used to) "Punk, last week you insulted me, the WWE, the WWE Universe, my employees, and... my family. What do you have to say for yourself?"
Punk takes a mic from his trunks "I'm just saying what everyone online, in the arena, and in the back wants to say. You can't touch me, Vince. I've got--"
Vince: "Cut his mic, I've heard enough. Punk, effective immediately, your services are no longer required. Please exit the ring." *punk looks pissed at being cutoff again, but quickly goes back to a smirk and goes to leave. Vince turns to the hard camera. "Now, as for filling the now-vacant spot at Money in the Bank. Tonight, we're gonna have ourselves a triple-threat ma--" *Punk awkwardly reaches around and rips the live mic from Vince's hands.
Punk: "You signed the contract, Vince! There's nothing you can do about it, not even with your army of corporate lawyers! I'm gonna be at MitB, whether you, Cena, and all your ass-kissing stooges--" *Punk's mic is cut again, and security rushes into the ring to remove Punk, but Punk lashes out and strikes McMahon hard in the mush. McMahon looks legitimately (physically) hurt and shocked-- not his usual pissed-off-and-wanting-revenge look.
Punk screams off-mic, but still audible: "You can't touch me, you sonuva bitch! How does it feel to be at someone else's mercy, huh?"
*People pour out from the back to clear the ring --heels and faces alike-- including Triple H, who yells at Punk "What do you think you're doing!? Who do you think you are?!". Cena, among others, is seen helping McMahon to his feet as the screen quickly goes black to commercial.*
The next couple of weeks, Vince says that, yes, Punk does have a contract to appear at MitB, and it's iron-clad. However, he won't be appearing on this nor the next RAW as a result of his actions.
Nexus comes out later and disavows any ties to Punk.
That's all I've got for now, though Vince could screw Punk by having the match start out reasonably normal, then have punk start no-selling Cena's big moves. Cena gets pissed, punches Punk hard and, while Punk's off his game, Cena leaves the ring, gets counted out, and retains his WWE title. The PPV ends with Cena saying off-mic "Good riddance".
Just my thoughts. Maybe this is terrible, I dunno. But it seems like it'd work to me, with maybe a bit of tweaking.
