It's hard for me to think of a single word to define the 6D, since I do not understand what Canon wants with it, as it is clearly confusing even for many of us here. Mainly (looking at the voting poll) I see two groups: one group saying that this is the FF Rebel, the other one calling it "the true replacement of the 5D Mark II". Let's start from these two groups.
1) If it is meant to be the FF Rebel: It won't succeed, as I do not think that a Rebel user will ever jump into FF without SEARCHING, READING and COMPARING first. Remember, we're not talking about "smurthphone photographers" or point 'n shoot customers here, jumping squeaking in joy with a bunch o' dollars to burn into the FF segment. We're not even talking about "four X" Canoneers (as in 1000D). We're talking about Canon users with 2-3 years of DSLR experience. And a pretty much GOOD experience, with bodies that used to deliver every bang for all the buck.
At this point, I would insert a group split:
a) Rebelers with non-expensive lenses and
b) Rebelers with expensive lenses.
Group a) won't bite the bait, since they will SEARCH, READ & COMPARE the 6D with D600 and frankly I do not see any reason not to jump ship. I definitely would do it. Group b) won't bite the bait, as I would really doubt that someone with expensive lens would pick a 6D with crippled specs for their "long awaited, yearned for" FF.
2) If this is meant to be "the true replacement of the 5D Mark II", then this will again fail. Just from the specs alone, most of the current 5D2 users won't see this as an upgrade. We're living in times of crisis, we're living in times of higher expectations from technology. We're living in times of internet, fast information, instant customer feedback, and in times of competition already making better moves. That quick drop in the 5D3 price was a confirmation that something went wrong in those "high level marketing forecasts", "trend analysis" or whatever they call it at Canon's. I would guess the number of 5D2 users saying in March "this new 5D3 has to wait, I won't upgrade right now" was quite larger than Canon initially predicted. As others here already well stated, this would rather push up the sales on the 5D3, but won't do any good in the price segment where 6D wants to position itself.
So, what the heck is 6D? Well, if no one can bring up some interesting, plausible explanation here, then I'll have to say one word: failure.