i'd agree, and given the 750 mined blocks courtesy period extended to those who haven't upgraded I think it would be in the best interest of any stubborn minority to accept the consensus view
In other words, the remaining 25% won't join because they agree to the proposal, they will join because they have no other choice (in case that this does really happen). Where quitting completely is not a choice.
the most possible scenario is the rest 25% to keep running the old bitcoin system and to change the mining system and ban asic miners. And i am very sure that for many months we will have two crap coins with no value at all and with 21 supply coins each other.