We've already seen too much of the 24th century. I wouldn't mind it at all if this movie stuck to only the 23rd century characters (except old Spock) and told more of the stories of the TOS crew...the stories we didn't hear in the all-too-few 79 episodes, as opposed to the 520 episodes of the 24th century.
"On the contrary, sir -- I think of this project as very important. It is you I take lightly." - James T. Kirk