People i see retiring and therefore dropping off the rankings in 5 years time are: Fedor, Mir? Nog, Barnett, Sylvia, CC, Couture, Hendo, Wand, Chuck, Rampage? Franklin, Griffin?, Babalu, Belfort, Hughes, Aoki? and probably more, but they're the ranked fighters i see hanging up the gloves.
Now my question is after you remove them from the rankings, that leaves a bloody lot of room, so my question is who do you think will occupy the spaces left by these fighters? Bones Jones, Davis, Hathaway, or another newcomer we are yet to see or hear about yet? Will be interesting to hear your thoughts.