If there were to be an animated TNG series, I think it unlikely that the middle-aged (at least!) crew of Picard, Riker etc would not appeal to the youthful demographic who mainly watch animated shows. Yes, I know that the likes of the Clone Wars or the Dini-verse DC shows are very, very good and don't just appeal to kids. But let's face it, that's where an animated show largely finds its audience in the West.
One option would be to take a Lower Decks approach. Set the show on the ENT-D or E but have the focus mainly on a bunch of ensigns and cadets, with the bridge crew as supporting characters. That way you'd feature the classic crew but have a youthful bunch for younger viewers to identify with.