Yes, I think people will prop Khan up even more as the one to beat him. I have seen some doing it for years. He's probably getting starched by Floyd of course.
Just the sheer fact that Khan is taller gives him more of a chance than Pacquiao ever did. It would be a more equal contest (power wise anyway). If GGG vs Mayweather ever occurred however, I think that Mayweather might have a hard time. Reality is, Mayweather will fight some bums to get the record to 50-0.
Khan would get KOed by Mayweather. His more reckless than Pacquiao. Pacquiao had moments but didn't do enough. It was clear both guys had respect for each other. Pacquiao couldn't land the big shots and Mayweather doing enough to win rounds like he always does.
Khan doesn't belong in the ring with Mayweather. He made Pacquaio look foolish, he would make Khan look completely clueless. Khan is tall and has fast hands, but his movement sucks. Floyd will beat him on movement alone. He also has no defence, so Floyd will tag him at will (which will be the token 2-3 times per round) and walk his way to a standard UD.