If your strategy is to release mid-range cards first and the high-end later, how could you NOT bring out a new GPU that matches the performance and price of an existing GPU? Obviously if you release the mainstream first then there's going to be an existing high-end that probably matches it on performance. And if that existing card matches it on performance, why the Hell would anyone continue to sell it at substantially more than the new card that it is no more powerful than?
Logically if a company releases mainstream first then what you end up with is a down-pricing of the existing high-end cards alongside new cards that can be matched by the old but are more efficient, have new features, etc., and a void at the high end waiting to be filled by the new generation high-end. And the previous generation vanish as stocks deplete.
You're asking for something that doesn't make logical sense if a company releases mainstream first.
Not "most". Just the minority enthusiast segment that makes up places like the OCUK forums. If it delivers that performance at this price, what it will be doing is turning high-end graphics into the mainstream.