First of all, to play the WBC a couple of weeks into spring training is ludicrous. You have team closers like Jason Grilli of the Pirates airing it out and throwing 94 mph fastballs and 40 pitches in relief. It's March! Not some time in July!
Secondly, and most important, how about injuries?
David Wright, perhaps the only good reason to watch a Mets' game this year besides having the pleasure of listening to their broadcast team, was sent back to New York for tests because his ribs hurt so bad he couldn't sleep. If Wright misses one inning of the Mets' 2013 season because of an injury caused at the WBC, the team should never allow another player to participate in the event again.
As I have written here before in this space, the WBC decides nothing. It certainly doesn't decide the most talented country in the world as the "World Baseball Classic" would insinuate. It really is just another revenue source for an already extremely lucrative sport.
The idea that one day we will see an MLB Japan, MLB Venezuela, or an MLB Italy and then have a new set of playoffs on top of the ones we already have here in the US is even more crazy.
We have already seen World Series games in November. Add more playoffs around the globe and it will become a near year-round sport, ruining the arms of a lot of pitchers. Personally, I would rather see fewer games than more.