I can't see it making much difference at all. Coaches will still get players to call them through their HS and travel coaches. Unofficial visits will still happen in some form or another. Parents will still feel panicked to take the first offer from a name school...and then tweet about it. And much of this will still happen before September of Junior year.
Our 2nd son was recruited almost entirely by phone and email. What will change about that from this new rule?
IMO, the rule (like most others) was written to not so much for the benefit of the players, but to not have to deal with kids dropping in all the time. Every dad with his PG/PBR/etc... profile was inundating coaches with visits and calls.
"Dead periods" were created primarily for the same reasons - to give coaches a break.
The commitments will still happen for those that can...