Can't say that any of this surprises me. The C's will just not overpay for potential. If Rondo comes out and proves that he is an All-Star and becomes a two-time NBA starting PG before the age of 25, don't worry, he will be here a long long time and Ray Allen probably won't be resigned.
If he has another up and down, inconsistent season and continues to show immaturity on the sidelines, in the locker room and on the court, he will be offered a fair deal or shipped out on a sign and trade or even be shipped out at the trading deadline(most likely scenario if by then he hasn't shown the front office and coaching staff what they want to see).
Either way, I think it was destined to come to this and I think it will be the right ending for all involved.