I think that in the wake of House of M, there should be a greater increase in demand for Mutant Growth Hormone. While there are certainly folks who are glad to have lost their mutations, there are also obviously folks who would very much like to have it back. Just look at how Quicksilver's got an upscale looking office to meet and help the ones that come looking for him.
Mutant Growth Hormone has also clearly not vanished. Patriot (of Young Avengers) seemed to have powers in the early going of Civil War, which suggests he had a cache somewhere. Nitro was apparently high on the stuff when he blew Stamford to hell, and purchased it from that corporation that ran Damage Control (they had a different name, didn't they?).
So the stuff's around. So now, I'd like to see a mob of desperate ex-mutants trying to find it. They can be people that enjoyed the power and status, people that want the security that their powers gave them, or just people...
Sorry, Tony Kornheiser just said Clay Aiken is his soulmate, and that he completed TK. Cripes.
Like I was saying, or just people who feel something's missing without their powers (I'm thinking of Cannonball's brother, the one with the wings, probably missing the sensation of flight).
I'm not sure where it would fit. Possibly as a job for Iron Man's Jerkass Squad. I mean Mighty Avengers. Or maybe the Thunderbolts. I'm sure Bullseye would like killing some desperate people.
Actually, since it would involve stopping a breaking and entering, probably a job for Cap's Avengers, seeing as they actually prevent crimes.