In past posts, some of us, including myself, have commented on the recommended approach by some experienced HS coaches such as Bob Hurley Sr., (AP may have heard it when he was signing) who tells most of his players to only sign for an aid package instead of the NLI until the spring signing period of their Sr. year. In this fashion, they're covered in case of a coaching change like Frank Martin's sudden switch.

we haven't seen any current Terps do this as far as I can remember. It would be wise for players to evaluate their personal circumstances.

http://collegebasketballtalk.nbcsports.com/2012/03/26/why-robert-upshaw-who-is-smarter-than-the-average-recruit/

Here's a passage from the article:

"Which is why what Upshaw did is so smart.

A financial aid agreement legally guarantees that you will be getting a scholarship, but it doesn’t bind you to the school. In other words, you are free to go anywhere else if you choose, but if you do decide to go to the school that you signed with, they will be paying for your scholarship. And with Martin potentially leaving Kansas State, Upshaw is free to re-open his recruitment. His list was narrowed down to Louisville, Georgetown, Fresno State and Kansas State when he committed, for what it’s worth.

So be smart, recruits. Don’t sign an NLI. Don’t be Joseph Young or Walter Pitchford. Control your own future and sign an aid agreement."