I think the time is ripe for a new animated series. As much as I would love to see one of the older series animated, I suspect it would have to be nuTrek to really be successful. That would be the crew to draw in the younger aged audience.
That seems the most likely possibility. Orci & Kurtzman already produce one animated spinoff of a film franchise they're involved with, Transformers Prime
, and we know they've talked about developing an animated Trek spinoff.
An animated Star Trek series would be a catalyst to attract children as new fans to the franchise.
Existing fans would enjoy it too.