You know, something occurred to me. Since the diagnosis House got from the rash was wrong anyway, the treatment for it would have been ineffectual. When House realized this, obviously he wouldn't let it sit, and I think the thing he's most likely to do would be to again go to extreme lengths to remember whatever it was he forgot. In other words, I think he would have ended up doing the deep-brain stimulation anyway, whether Wilson asked him to or not. Hell, whether Wilson *protested* or not.

See, I've been looking at Wilson's request from the stanpoint of plot. Looking at it this way, having Wilson ask was really just a handy way to save screentime.