Will George R. R. Martin live long enough to finish his GoT series?

I know this makes GRRM angry whenever its brought up, but I have to ask the question anyway. Robert Jordan gave an outline, notes, and ideas to another writer to finish his Wheel of Time series. So far, GRRM has refused to do so. In my opinion, his publisher should either make him pick another writer or they should pick one for him.

Its nothing personal against GRRN, but his age and weight have to be taken into consideration. He has millions of fans, and he owes it to them to make sure his series gets finished with or without him.