Maybe . . . .
I think that it could happen, though, what keeps popping into my mind is the idea about the mentaility that could possibly develop. That it'd generally be treated as a 'fad,' and that it could become a hip thing to do for a while, but then lose its popularity the way huge and baggy jeans did after the late '90s.
As it is recently, we tend to loose interest in things pretty rapidly as a society in general. Hell, in the ninties, we went through more style changes then I could possibly recall, and we definately couldn't settle on anything for any real length of time.
Of course, all those who perminantly altered themselves would then have to deal with the fact that they could possibly find themselves out-of-date within a considerably short time.
That's a scary thought, and if we did start seeing things like massive reconstruction like described in this thread, to avoid becoming just another victim of the fad bug, we'd have to steer clear of jumping in, ourselves, until we're pretty much certain that it's not leaving anytime soon.
Though, the simple fact that the majority would be hesitant would possibly be the very thing that makes it become just a passing fad.
See the catch 22?
Personally, I don't think that I'd be all too eager to jump on it myself, if for only for that reason . . . aside the fact that we're not talking about being our characters and acutally wanting to simply become something physically different.
This topic isn't like the other thread where we were asked if we'd like to be our fantasy 'characters' if given the chance--something that I'd be more willing to be apart of. This question takes everything to a different level in which, if the possibility arose, would we literally reconfigure our bodies in a medical sense--aside from all fantasy and the like.