If you look at most of GSP's title challengers a lot of their careers have taken a turn for the worse after losing to GSP. Alves was actually ranked P4P before he fought GSP. Fitch has looked more human in every fight after the GSP loss. Hardy is pretty self explanatory. Kos and Shields have looked pretty garbage too.
A lot of people keep saying that maybe GSPs competition really isn't that good especially when the rest of the division knock out former challengers that GSP decisioned, but I think that a loss to GSP really messes up a lot of these guys mentally. You can argue that the same thing happens against Jon Jones too when someone fights a guy that they know they cant beat and they realized their life's work probably cant get them the title as long as that guys there. I think the same thing doesn't happen with Anderson as much because his fights are more flashy and you get people having those "lucky kick" delusions thinking they still have a shot.
Do you see this happening to Condit? Given the nature of Condit's loss in that it was one-sided, but he had GSP on the ropes I think Condit is actually a guy who will get better instead of fall off the map like the rest of those guys.