What they should have done, or more correctly should do is a movie with characters from TNG, DS9 and Voyager.
Together, those three shows hve a lot of fans and therefore a movie with characters from those series would have a chance to attract most of those fans.
At the same time, they could introduce a new crew which would be the main characters in an upcoming series, a series where some of the old favorites from TNG , DS9 and Voyager would show up from time to time.
What the movie and series would be about? A lot of possibilities here. OK, the Borg plot mah have run its course but there are other species which could provide some threat. Species 8472, the Kelvans, Cardassians out for revenge, the Dominion or something totally new.
As for the upcoming movie, I have my doubts about it.
Most of the TOS fans will not accept other actors than Shatner, Nemoy and the other "legends" for portraying their old favorites and most fans of the other shows seems uninterested. I guess that most of the fans (including me) will watch it only because it's Star Trek.
TOS was a wonderful series with some of the best characters ever created. But let it rest in peace and let us remember it as it was. The new movie looks like just a desperate attempt to milk the last possible profit out of TOS.