The Original Trekkies just seem slow to change.
I'm pretty sure the newer set of fans brought in from the most recent movie wont be screaming for murder because the second in this new chain of movies is already underway though. I think by the time the next movie comes out the vast majority of Trekkies will come to terms with it and consider the movie to be canon. Just like it took them a fairly decent time to accept everything after TOS as canon.
Of course you have anomalies like ConfusedMatthew, who thinks Nemesis is better than First Contact.