If CBS does make a Star trek cartoon in the future, who should be in the voice cast for this cartoon? Should it be just veteran Star trek actors or should they also hire professional voice actors, like Frank Welker and Jennifer Hale?
That would depend on whether or not their characters are on the show, mostly. I mean sure, we could have Michael Dorn voice someone who isn't Worf, but if you have Michael Dorn... might as well have Worf. Obviously. Regardless to whether or not a Star Trek animated show uses old Star Trek actors, it'd use professional voice actors somewhere (or in all the roles, if it's a new cast of characters and/or different voice actors playing known characters.) And... I don't know. Aisha Tyler as Uhura? Is that too obvious?
An animated Star Trek series would either use the movie characters, since they have the most PR value, or simply invent new characters. Since it would be hard to get all the movie actors to reprise their characters for a TV series, in either case, professional voice actors are the way to go.
Sure, and you can have Peter Cullen play the captain, and Frank Welker can play the evil Klingon captain, and their crews get into a fight aboard the same ship and it crash lands on an alien planet where all the life forms are machines... Kidding. The answer to your query is "Yes." What's going to happen is what's been happening in cartoons for years now. The cast will be a mix of veteran voice actors, traditional actors new to voice acting and traditional actors with a lot of experience voice acting. Several veteran trek actors fall into all of these categories. Even if the animators don't go back to the well and use known characters the veteran trek actors can still be part of the cast.