Well, he could go through a lot in a short time.ravenshrike said:'cept in The Doctor's Wife IIRC the TARDIS said there were something like 32 internal main console configurations left that he had yet to use. So with the latest change that leaves 31.Gordon_4 said:What's springing to my mind is some serious fucking retcons or ass-pulls are going to need to be made unless they can pin down the next Doctor for like a decade: this will be Regeneration 12, the last one.
I mean when they put this in after William Hartnell left, they probably didn't think they'd get that far.
You'll notice that when Clara goes into his timeline and sees all his regenerations he'd had before he died, that's just him, the previous doctors, and one John Hurt. Not even a Valeyard to be seen.