Actually the it would be very unlikely for the 780 to "Crush" the 690. Pretty well no previous generation of card has been able to dominate its predecessor in SLI. That would require a nearly 2x increase, and that really doesn't happen.
Based on some numbers I've ran, the GTX 780 should come out anywhere from 5%-15% faster than the GTX Titan, but with lower power use (roughly 5%-10% higher than GTX 680) and a smaller price tag of between $500-$600 thanks to 22nm fab process. The numbers I ran are on the assumption that Nvidia wouldn't be stupid enough to release a 780 that's slower than the Titan, which is where my original estimation of the 780 would have fallen (had it been released now, as opposed to the Titan). All they've done with the Titan is put out a "True" 680 as they were supposed to initially (remember the 680 was never intended to be the 680). They used the same die size in the titan as they had in the gtx 580. So the cost for Nvidia goes up. But it allows them to get one last hurrah out of the 28nm process.
Some numbers you ran up? lol I would like to see where you got those numbers from. For a start the 780 is just a refresh, It's not going to be a 22nm chip. It's going to be built on the 28nm process. So all your numbers are wrong.
Also ithe 780 is not going to be faster than the Titan. Normal refreshes are generally between 15 and 30% faster. Personally I am hoping that both AMD and Nvidia get a little more performance out of this round of refreshes than previously so I am hoping for a 50% increase.
And can't you get it out of your heads, this isn't a normal production card. It isn't a 680.5 or whatever. It was a card designed for use in supercomputers that is now been turned into a gaming card and in very limited quantities because these cards are been made from binned parts that didn't make the cut for the K20x and K20.
The sale of this won't affect the sales of any other cards. The people who will buy this aren't the kind of people who worry about cost and chances are they already have a high end system.