I hope he beats Tom Baker's Record
No disrespect to Tom Baker but Matt Smith is in my opinion the best Doctor ever. You can tell he loves the role, the fans, and the cult following the show has. And he is also evolving as the 11th Doctor...his version of the Doctor is changing as time goes on, and I did not see that much, even with Tennant (Sorry David).
So I can deal with Matt being the Doctor for a few more years. I really think he is aware that he got cast in the role of a lifetime and is appreciative of that fact.