The Doctor wouldn’t. He’d find another way.
I’ve been thinking about what Moffat says about the 50th and the time war and I think what Moffat chose to do was simple.
He treated the 50th like any other episode of Doctor Who.
Maybe this approach wasn’t the best in some ways and he could have made it more of a celebration of the shows history but on the plus side when it came to writing about the time war he didn’t just treat it as backstory. He didn’t accept it as an inevitable he approached it from the character of the doctor.
Clara pretty much says this in her “be a doctor” moment. She’s saying “do what you always do, find another way”
I do understand why some Russell era fans got annoyed because it feels like an enormous part of his character but people should remember the time lords being gone was not a central part of the doctors backstory for many years. I’ve seen people compare the return of the time lords to bringing back Batman’s parents but in reality it’s more like bringing back Jason Todd or Bucky in Captain America. It doesn’t undo what the Doctor felt when they were actually gone.