Grandfathered? Until you sign NLI for your sport its anyones spot, and I would bet there are 5+/- kids per position per recruiting cycle a coach is chasing. Everyone is replaceable.
A kid should only worry if he doesn't keep playing at the level he was recruited at. They need to keep working as hard or harder and things will most likely work out. It's the slackers that could be bumped. Only kids I know that are not actually going to their commitment are those who traded up, or did make grades and had to trade down.
