Well, like I said, this particular movie is selling itself heavily on nostalgia, in much the way the BSG, Transformers, etc, did. This is always a tricky thing to do. BSG re-invisioned a weak (and also self-parodic) franchise, so there was little risk in alienating old fans. (Both of them protested, I heard.)
Transformers was a franchise that had ALREADY been re-invisioned multiple times, and was a 'kids line' now designed for an 'adult' audience. A lot more could be forgiven.
But Trek? This is new. Redoing something that ingrained inthe public psyche is an immense undertaking. Like I said, you can make changes, but the more you change, particularly doing so while insulting the source material (see the threads here on the old model), you're shooting yourself in the foot before you've even started the race.