I think he will have an even better year in 2012 and not only he will defend all his titles, but he will also win RG beating Federer in semis and Nadal in the final. Watch it, I'm hardly ever wrong with these things. The absolute domination of Novak 2.0 has just started. I kind of pity the other players and their fans.
This is more than a little ridiculous - so Novak at 25 will win over 10 titles including a calendar year slam (that's the implication if he defends all 3 slams and also wins RG!)?! Novak played an incredible level from Aus Open to about Rome/RG. After that despite winning 2 more slams his level was not unreachable at all and players like Fed, Murray, Del Potro, Tsonga and yes, even Rafa, will not be just handing over those trophies next year.
The domination of Novak 2.0 ended at RG - he didn't "dominate" Wimbledon (losing sets to Baghdatis & Tomic), he didn't "dominate" the US Open (in fact funnily enough Nadal's 2010 win was more dominant than Novak's 2011 despite Novak clearly being a better HC player! Tipsy & Dolgopolov were more of a handful than any of Nadal's opponents till the final in 2010....) and the less said about his season post-US Open the better. Dominating is winning a slam like Fed did Aus Open 07 or Rafa the French in 08 - that is very tough to do and even Novak with his 2.0 level will not steamroll every opponent in sight forever. Fed in 04-07 looked quite untouchable by most players - Novak apart from that early hardcourt stretch last year did not reach that level IMO - consistency, which was his best asset, is not something you can rely on to be there for years on end. Fed's forehand was a weapon that was simply unplayable at his best - Novak's backhand as good as it is cannot be compared in the same way.
On the topic itself - I think he has a great chance to still stay year end no.1 and defend 1-2 slams, and 2-3 masters (either IW or Miami - unlikely to be both; one of the clay masters and possibly Rogers Cup). He'll obviously defend Belgrade and probably Dubai too.