I’d be willing to bet that, whatever they end up doing with the format, they will do a full-scale reboot. Young Doctor steals the Tardis and goes on adventures. “How did he develop this strict moral code? By making mistakes.” That sort of shit.
Feels like the BBC should throw some money at Billie Piper and dedicate a tiny budget to a Night of the Doctor style short where they resolve whether she’s The Doctor or not, then it end in a way that allows a real Doctor to take over next time.