Honestly, I think we need a TNG-era movie more than we need a recycled TOS.
A TNG-era movie with characters from TNG, DS9 and Voyager will, if it's well-done with a well-written story and well-advertised, attract fans of those three series. It will also attract most of the fans with an interest in Star Trek and hopefully also some new fans, most likely those "newbies" who are now watching re-runs of those series all over the world.
Hopefully new fans? Do you think Abrams went to Paramount and said "I'm going to do a movie that a few existing fans will really love and hopefully will attract some new fans?"
I can't think of anything worse than wheeling out a bunch of overweight TNG, DS9 and Voyager actors for a movie designed to revamp the franchise. It would need a plot drenched in implausible fanwankery to get them together in one story, and it would cater to about 17 people (and don't start using TBBS posters as indicative of what the audience wants to see).
As someone said above, I'm only interested in this movie because it's a prequel. If they churned out Star Trek:Implausible, where Picard and B9 happen to meet Lt Paris, Neelix, Worf and Chief O'Brien just in time to save the universe from Porthos' clone, I wouldn't even pirate it, let alone go and see it, and I suspect a large number of other people would feel the same. We want something fresh and new, not a recycled contrivance from Trek's failed era.
Since I actually like TOS, even if I do like TNG, DS9 and Voyager more, I can't think of anything worse than seeing some half-decent actors try to impersonate Kirk, Spock, McCoy and the other legends. They can never be those characters in the same way as Shatner, Nimoy and the other legendary Star Trek actors could. I don't want to see a TOS movie where the interior of the ship looks more like Voyager than the Kirk era Enterprise and I don't want to see established Trek history being screwed up the same way as it was done in "Enterprise".
I don't think that the names of Kirk and Spock will attract that many new fans. To be honest, I do think that the re-runs of all the Trek series all over the world have attracted more new fans and will attract more new fans than a movie with recycled TOS characters will do.
As I've written before, it must be a very good story, a very good production and brilliant acting if this project will succeed and I'm not so sure about that because if those in charge of the project cares more for money and possible ratings than good storytellintg and good characters (not to mention the portraying of the characters), then they are on thin ice.
The solid fanbase Star Trek have is what have kept Star Trek alive, both after the demise of TOS in the 60:s and after the recent failures with "Nemesis" and another prequel, "Enterprise". If the new people in charge abandon that solid fanbase and the whole premise of Star Trek in order to attract or please potential new fans, then they will end up just like so many sell-out rock bands have done, by losing everything. The solid fanbase will turn their back to them while the newbies who might be attracted by "terrific effects" or how cute some actor is will move on to next novelty.
What did bring Star trek back to life in the 80:s was a new TOS movie with Shatner, Nimoy and the others involved. What would have happened if they had used new actors for the first movie? It would have failed and been forgotten.
The combination of using the popular TOS characters and actors for a couple of good movies followed up by a new crew in TNG was what made Star Trek big in the 80:s and 90:s. A prequel with recycled TOS characters is a step in the wrong direction.