I think, IMHO, that the 6D is not designed to be a studio camera or a pro photographer's first choice body. It is rather aimed at the serious enthusiast looking to enter the FF world for the first time.
Not sure if you can categorize the market quite like that... but... maybe.
The question of who Canon is "marketing to" always is (or should be) a matter of what their market research has revealed... which these days has in itself been very questionable!
I see it more like testing the waters... and bowing to competition from other brands (like "N").
Canon took the market at the bottom with the first "sub-$1000" Rebel. They owned that segment for a decent amount of time too. I'm not sure if the competition is going to be as lax going forward... recent history (last few years) has shown they're not, and are likely to become even greater competitors.
We've gone from sub-$1000 DSLR to the sub $500 DSLR with lens of course. Look at what you get in that price range compared to what was available at sub $1000 back in... what was it.... fall 2003. Nearly ten years, yes, but the technology has moved in leaps and bounds.
Think of this - what would a 6D capable camera have been worth to the photographic buying public (all segments) in fall of 2003? At least double is my guess.
I'll also guess, the best is yet to come....