I agree he's having a very good season so far despite missing a few games, but if you take a look at his All Star game stats, they are quite dismal. I don't think he gives his best during the All Star games. Probably worried about getting injured.
At the Centre position, IMHO, he won't match up well with the behemoths of the West - Gasol, Cousins and Davis. He plays more like a F than a C. He only averages 7.5 RPG. I think Kevin Love is a better choice despite the lower PPG.
But aren't all star selections based on first half regular season performance? So all star stats aren't really relevant in the selection of all stars. How can Kevin Love be a better replacement? His ppg is down by 9 ave pts, has a FG% OF 42%(Bosh-47%), 3pt% of 33% (Bosh-37%), 2pt FG% of 49% (Bosh-50%), PER of 18.8(Bosh-20.5).
If you're worried about Bosh at the center position, what more Love replacing Bosh and going up against Gasol, Cousins and Davis. Defensively Love is giving up 7.5FGs/game(Bosh-6.2), 15FGAs/game(Bosh-13.2), 50.3%FG%/game(Bosh-47.2%), and the difference an opponent's FG% versus when Love is guarding him +3.1%(Bosh-+0.7%). So basically Love is more of a disadvantage defensively versus Bosh.