I would like to see Wild Child de-powered ONLY if it would make him some semblance of the character he was late in Alpha and through X-Factor, a three-dimensional, fleshed-out person with his own mind and that sharp whit of his...not a one-dimensional villain or brain-washed Nosferatu...
As to who I'd most like to permanantly lose their powers...Sabertooth, definately Sabertooth...but that's not gonna happen.