[Flux]

I doubt we will see David or Catherine back again - if RTD does go down that path, it will be the case of ever diminishing returns and the viewers will get bored.

Remember that David was in the 50th in 2013, then a decade of waiting and he returned for 60th, if the show is still going by 2033, that would be a time to wheel David out for the 70th, and probably he wouldn't have aged much, as David seems to be unique, he looks always fit, healthy and fantastic

Which is why I’m even more baffled why RTD has left himself such a gaping plot hole for future episodes. Whether they’re living in France, in London, or popping to Mars for a holiday at the wrong time, their lack of appearance in any serious Earth-bound threat is just going to be awkward. He’s usually a very thorough writer, and I’m surprised he didn’t come up with something just to lock them away (for now). Maybe Rose Noble will be relaying some news to 15 to help tie up the loose ends, but as other posters have mentioned “they’re living in France, soz” is hardly an excuse!