If I were Khan I'd retire, but if I were any fighter who had made millions and had a solid chance of being knocked out in any fight I would retire. I think he's a bit of a goof so I don't care what he does either, but he's always decent to watch. This fight doesn't affect his value at all for me, because the outcome I expected is what happened yet he gave a good account of himself prior. He has had the flaws/made the mistakes that lead to this KO for his entire career, don't see any reason to think he's damaged goods. I would have picked Brook to stop Khan regardless, it's the same fight if it gets made now that it would have been.