I dont see Miguel going back down to 147. I think if he were to avenge his loss to Trout and/or knock off Molina for his belt he could get another shot at Floyd at 154. Floyd handily won the first fight but a unification fight at 154 could make some real nice money for both Floyd and Miguel but I dont think Miguel wants to retire with a L in his last fight.
I doubt Floyd will ever fight above 147 again.