Too much sentlement towards ideas and productions of old cancelled TV shows in the 1990's - there is only so much you can spin off from the original Trek concept, that's why the reboot is the only way to make Trek work in today's mainstream.
Not just the mainstream. I was a Trek fan from before TNG, and I'm burned out on spin-offs. I just want real Star Trek now -- Kirk, Spock, the Enterprise, and a good story. No Captain Benson Harding of the Federation Starship Pantheon, no Cadet Sel'ltza of Starfleet Academy's elite Red Squad, no Captain Elizabeth Walker of the 29th Century Federation Timeship Moon-phase.
I'm not a big fan of Abrams' Trek, but it's given me hope that the next reboot could be even better. And, if not, the next one after that could be good. But no more TV spinoffs. Team Berman beat that horse to death.