Speaking as a TOS purist, I think that just as nuBSG was a 9/11 series, TOS was very much a Cold War show. Even more than it was Mormons in Space, it was a late-seventies hawkish nightmare scenario of a universal Communist takeover.
TOS was utterly "of its time" and even if Richard Hatch does get to make his follow-up it will be a nostalgia project. As such, it could sustain a single movie but not a series.
Much as I hate to admit it.