You may be right. I personally have not been looking at the evolution of DSLR models for long enough to say.

What I noticed - not necessarily related and to be taken cum grano salis as my memory does not go much back in time - is that Canon tries to have one or two specific distinctive features per every new model. 5DII was the one with excellent video. 7D was the fastest shooter, 5DIII has the highest ISO, 6D now comes with integrated WiFi and GPS, 60D had the swivel screen...
I wouldn't be ale to say if that is good or not, as in the end what matters is how each model compare with its competitors overall. I am just saying.