Appeals to authority. I have one single better reason for fans to relax:
1. It Doesn't Matter. If Abrams succeeds with this, Star Trek going forward won't be the Star Trek that brought everyone here to talk about this project back when nobody knew anything about it.
That Star Trek is dead.
If you can learn to love the new one, great. If you can't, well... the one you loved this whole time has been gone awhile anyway. In the end, whether the new franchise sink or swim, the classic franchise is dead.
Nothing more to worry about.
"Now I did a job -- and got nothin' but trouble since I did it, not to mention more than a few unkind words as regard to my character, so let me make this abundantly clear: I do the job... and then I get paid. Go run your little world."