But the answer to “Why didn’t they do this?” lies in the movie itself. In Infinity War, Doctor Strange saw all possible futures and they won in only one- the one where Tony Stark sacrificed himself. So he could have presumably seen this option as well but didn’t quite see it working out. Maybe this entire option could be explored in Marvel’s What If series? Or maybe in Doctor Strange 2? After all there’s tonnes of rumours floating around about the show already. From quicksilver appearing to Wanda being the next MCI villain, anything and everything goes.