Powerhouse should be brought back and updated. I had hoped that Rogue would be Marvel's version of DC's Parasite, but Powerhouse is a better choice, since she has no choice but to feed on the energies of others to survive. Besides, it wouldn't hurt for Marvel to have another powerful female baddie. She probably works as a villain in just about everyone's rogue's gallery.
Not so sure that Luke would want to team up with her, though.