Amir Khan time in the US soil as an attraction is gone with that lost. I don't think he can still secure major fights unless he is willing to be the next stepping stone of young prospects. Khan should just fight Kell Brook in the UK, but it looks like Brook is looking for a Crawford showdown now. I didn't see any improvement on Khan, he is still vulnerable to left hook as what Crawford did to him in first round. He is lucky that it didn't landed flush, otherwise it's a KO.
Amir Khan was never an attraction in the US i think. With that quitting, boxing promoter won't waste their time signing Khan. This might be the time to hang up his gloves.
The question is, are we going to see a Crawford/Pacquiao showdown?
I don't think that fight would happen. This time around, the Pacman is very choosy with his would be opponents. Crawford is a dangerous fight for Pacman this time of his career. Pacman would choose opponents that will make him look good for him to land that rematch with Floyd which i think his last fight.