To be perfectly honest Far Cry is such a good game that more of the same in Far Cry 2 would not be that bad. Bigger, and er, more bigger ( as my 2 year old daughter would say ).
C&C has been pulling the same trick for years and it is still playable.
Maybe that is the ideal scenario, new innovation being taken over by the mass producers and the innovators leave to start something new again.
Mind you, having watched Matrix 2 and 3 and thinking they were complete bollox, I might be talking same myself.