The division will never be "cleaned out". Ever. Don't care how long Floyd fights there.
Cotto, Margarito, Mosely, Williams, Clottey, Bonsu, Cintron, and Berto are all at 147.
Just below you have Hatton, Castillo, Malignaggi, Hopkins, Urango, and Holt.
Just above you have De La Hoya, Alcime, Mora, Julio, and Powell.
Assuming he doesn't fight De La Hoya, Hatton, or Castillo again, that leaves about 15 fights for him to "clean out" 147 and the legitimate contenders one class above and below him. Assuming he fights once every three months, which is a VERY generous estimate, it would take him a shade under four years to "clean out" the divisions.
That's not counting any new talent that would crop up in the meantime, which would only lead to more talk of some new guy that Floyd would need to fight.
If the guy is burnt out and just doesn't want to fight anymore, expecting him to spend another half-decade fighting just so you can be satisfied with him "cleaning out" a division is ridiculous. Too many times we see a guy in his older years and say "I wish he would have gotten out on his own terms"?
We won't have to say that about Floyd. Quit whining.