I would personally love it but if they did it that way they'd also have to copy the animation style of the Filmation studios circa. 1973
I'd love it if they did a time travel episode in that vein and explained the change in animation style as a temporal effect. If they could get any of the original TOS actors to lend their voice talent to the episode that would be a plus IMO.
but I doubt anything like that whatever across their minds are that they'd want to go that far to pull something like that off
I imagine they could just ape alot of the basic character designs, while modernizing movement, dialogue, and special effects. Trials and Tribble-ations is a good primer, as they paid homage to the original episode, while developing 1990s-TV appropriate ships and stuff.