"Only" 12 rather than 15, but yes, it would be nice to see Murray defend his crown. This time if he did it he'd have to get past Wawrinka, and then almost certainly Djokovic and Nadal in succession -- which would be some achievement given the way Nadal's been playing.
Still now that Murray has two majors including Wimbledon, anything else is a bonus. Best British male tennis player since Fred Perry by some distance, and were it not for the fact that this is the era of Nadal and Federer and Djokovic all at once he might even have been looking at 10+ slams. As it is, I think he has a good shout at making it to 5.
Interesting statistic about Murray at Wimbledon: he has always at least matched his previous years' performance every time he's played there!