I tend to disagree here on some things.
My son's dream school was UM, if he had pursued it sooner than he did, he would have made a big mistake. BIG. His mind changed after his very good friend played there, that was it for him. One might be looking at a program through rose colored glasses, when very young. Your dream school may not be the right fit.
The coach has nothing to lose the player everything, the recruiting process stops, things change, parents finances change, coaches change, programs change. If the player is really good they'll offer him later on. I am talking about VERY early commitments (3-4 years in advance), I just read where a 2014 just committed to a program.
I think the NCAA should put a lid on very early commitments.
It's just a commitment, take it for what it is.