Another thing to consider is that Canon(and Nikon) continuing to push 2 sensor sizes at us means they can sell an entire other line of lenses & cameras. And profit big time from it. After all, for them it's really all about maximum money. And the Japanese have proven very slick at this game, spoon feeding the consumer better features. They get the max they can out of the previous before moving on. Maybe initially they thought once the cost of FF sensors can be brought down a bit they'd put us back to the 35mm size we're accustomed to. But they realized the profits possible w/two lines vs one, so on they go. Now they have two loyal fan bases, which I'm willing to bet they predicted in advance.
Yeah, sure the FF sensor is still today a bit more expensive than the crop but they'll never fool me to believe they couldn't easily sell a very capable 7D quality DSLR body w/FF for under $2000 & still make a nice profit. Greed prevents it, & we go without. For now. Sad but true. Look where they went with the new 5DIII. A great camera it seems, but look where the price went!
I mean, think about it. Remember when the first digital cameras came out, for YEARS they pushed on us a smaller sensor that screwed up the equiv focal of all our EF lenses. Instead of trying real hard from the getgo to work on a sensor of 35mm size & get Q better & price down like they've done all kinds of other technical achievements. And get us back in the format we're used to. I waited long as I could for them to do this, before going digital with a 350D. It just started to hit home they'll never place priority on servicing the customer best while making a nice profit, they just put maximum profit first & foremost.
Don't get me wrong I actually like the pulling power of my 7D's crop sensor for my shooting style, even if it destroyed what I bought my 28-70/2.8L for. But I think the sad fact is it could be quite a while longer if ever before they'll make a FF truly accessible, they simply like the maximum money by having the 2 separate sizes too much. Much of what I'm iterating may be speculative, but I doubt it's far from the truth!
Mark