I honestly don't think anyone is untouchable. I LOVE Lowry and Martin, but fact is they are role players, neither is a superstar/can close a game, if the right offer came along I'd give them up.
Well the bright side right now and the first step to success is Yao Ming is done. The Rockets can finally move on from the Tmac and Yao's era. We're basically starting over right now with a new cast. At first it will hurt but we all have to be patience. Its 2011 and the beggining of a new era. Even though the Rockets don't have a star player right now, they will get one soon enough. So just look on the bright side, Yao is done so no more depending on him and dealing with all the set backs.