Re: Anti-rejection drugs. I read an article in the newspaper a while back in which they discussed an experiment that was performed recently. Apparently they took several patients who were scheduled for a kidney transplant and did a bone marrow transplant from the kidney doner first. At the time of the article, all of the recipients had had their new kidneys for 2 years, were not on anti-rejection meds, and had no problems with rejection.
The problem, of course, is that in order to do the bone marrow transplant, first they have to kill off your own immune system. That's probably not something most doctors are going to be willing to do for "cosmetic" surgery.
In answer to the original question - if the procedure had been proven safe and effective - i.e. I would end up with a fully functional, normal-looking penis, with low risks for complications, then, yeah, I'd consider it. That being said, I'm not all that unhappy with what I've got now, so I certainly wouldn't go for it if I was going to risk ending up with some half-way functional, odd-looking frankenwang (like you get with most modern phallos.)