I think no one really know what's the limitations of human beings.
Two of NBA players I know has similar kidney problem.
1. Alonzo Mourning became the first Miami Heat player to have his number
retired. http://en.wikipedia.org/wiki/Alonzo_Mourning
2. Sean Elliott play with Spur to win 1999 NBA Final with kidney disease. http://en.wikipedia.org/wiki/Sean_Elliott