I would never rule out Pacquiao from any fight and will always watch his fights, it was unfortunate to see him lose against that aussie guy last time. His 2 win streak was looking good after the Floyd fight. If he is in good physical condition he can keep doing it for a while. I see him still kicking ass past age 40 if he stays in shape and active like Hopkins. But he has a very physical style, unlike Floyd which was able to slow down the pace of a fight and perform surgery on opponents. Pac may have difficulties with young prospects.
My favorite right now is Loma, but he has to still face bigger names to become a future hall of famer.