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.
I think he was once touted to be the next main attraction. He has lots of fight that generated good numbers, last one was with Canelo although we all know that Canelo is the A-side during that fight and it was really a mismatch. He can still get some decent fights I guess, but the paycheck might not be what he was expecting though as this lost really did a lot of damage on his boxing legacy.