As crazy as this sounds i have a weird feeling floyd might try to price himself out of what could be potentially his highest earning bout, due to his issues with bob arum and his reluctancy to potentially tarnish his undefeated record
If he wins his next fight this fight will happen 100%, don't pay attention to talks till his fight with Marquez is done and they're open to discuss the next fight, right now all talks mean nothing and are nothing but rumors to promote it and keep fans excited/confused. Mayweather's return is clearly to fight the #1 P4P(his former title) and his choice of opponent being Marquez should be better proof as well since Pac's last two opponents are also Mayweather's opponents.
PBF came out of retirement to fight Pacman. He is taking the Marquez fight because it will help promote the Pac fight even more and also it would be foolish to jump in against Pac after all that inactivity.