His Fielding Percentage (old school cool) at 2b is really high and most people that have worked hands on with him believe he'll work out there fine long term. He won't be Pedroia over there, but should be average once he's comfortable.
The problem with the "he's a kid" is that this seems to be what the organization is holding out for. They are putting all their eggs on many of these prospects working out. I love prospects. I like a few of these prospects a lot. Not every prospect works out! The Sox don't have a history, especially recently, of churning out MLB talent from their farm. This is a very risky thing to try with this fanbase. They want a long term rebuild on an expensive product. This is John Henry's fingerprints. If there isn't a WS in the next decade, it's not because of the long line of CBO's but because of the restrictions put in place by the owner.