I believe that Dr. Kalam has still lot to offer as President and should continue.
Million dollar question is whether UPA (United Pichada Alliance) wants decorated & learned person like Dr. Kalam to continue or not. Going by Congress's history, they always wanted people who can dance to their music as President of India. I do not see a possibility of Dr. Kalam being elected again as President till the time Congress is at the helm of the affairs.