While taking the best bits of all racers could be seen as an evolution, I rather cringe at using that term to describe it. To me, and I think most people, a game which is evolutionary or revolutionary would have some aspects to it which advance the genre in a unique way. Not gene splice the best bits of all games, but create your own new genes.
Evolution, however, is not about creating a new set of genes, per se. It's about being the fittest in a given situation.
And the situation, currently, is being the best among a lot of different sim racers with different strengths and weaknesses. Personally, I don't think evolution makes innovation a necessity; even without innovating a new feature, a game that pulls off all the good stuff we have seen so far, in a single game, would mop the floor with the competition quite easily.
I mean, think about it.
A game that gives you:
1000 cars, looking like GT5's premium cars
A level of customization along the lines of Forza
iRacing-esque physics
Dynamic weather and time on all tracks
Support for all steering wheels on the market
Highly detailes damage model, both visual and technical
Long and challanging offline single player
Deverse and well structured online mode
Headtracking
3D
Decent penalty system
It may not do anythign new, but, to me, it would become my go to game in a heartbeat.
In other terms, reinventing the wheel isn't necessary, in my opinion. Neither is inventing the engine or the chassis. Somebody should just put the best chassis, engine and wheels together to make one fine car, though.
I'd prefer that over a game that tries to innovate for innovations sake - which, in my opinion, is somethign that plagues the current generation of video games in general.
Exhibit A: Final Fantasy XIII
And Kaz's talk about mimesis sounds just like that: Innovation for innovations sake.
Someone is going to design a racing game including my above bullet points, and I hope it's Kaz, unveiling it in GT6. I don't think another game would quite do it justice.
Why? If a game contains all the good stuff, does it matter who it was made by?