I think he was very honest with "youll see what happens". Trump is getting old and others might start to rise. He cannot really gauge the situation that he will be in 2 years. If he feels like he cannot handle it(which I doubt he has so much energy) or if there is a true successor I think he will not run. What I am sure of from the interview is that hes staying in the public eye which is the best hopium we can have.