If they were to do a cartoon, then what would the Doctor look like? Would they base him on a current incumbent, a past incarnation or create a new version, possibly looking like a composite (as per the concept series Doctorwhovian mentioned?
I think the series would lend itself to such a format. But as with, for example, the animated Captain Scarlet from a decade or so ago, you might find that the quality of the animation would outweigh that of the stories and scripts. You wouldn't want to take away from the main series by giving this one the best scripts, though it would be a good way of airing stories which were too expensive to realise in live-action.