Except even with all these improvements, a crop camera cannot beat the benefits of a full frame. So even if they launch our wish list 7d2, the full frame cameras still have their appeal.
Except the price lol
For now... Who knows what the technology of the near future will bring.
Try and remember that APS-C sized digital sensors came about because Advanced Photo System's film sized formats (C, H and P) was introduced right around the time that digital SLR's were first hitting the market (1996). That is why, unfortunately for Kodak, that size of film format never really took off.
Canon and Nikon (among others) saw this as an opportunity to be able to produce a smaller digital sensor to help keep costs down and to get digital cameras into the hands of many as possible, while keeping to a known film foramat size. (Something that was VERY important, at the time, in getting someone used to film to switch over to digital) The APS-C format was something people were already familiar with, so it really didn't have much to do with image quality or one being better than another, it was a way to produce a DSLR cheaper and advertise the "additional reach" you can get with a crop sensor over FF! That was one of Kodak's main marketing strategies for the APS-C film format!
Well, it worked. So much so, that we today have evolved into 2 main groups of DSLR lovers. Ones who love FF and ones who love crop sensors. They both have advantages and disadvantages over each other. Sensors are getting cheaper and cheaper to manufacture so it really isn't so much a matter of pure costs anymore. Canon and Nikon (and others) recognize that even though they could inexpensively put FF sensors into ALL of their cameras now, not everyone is going to want that.
That's why Canon will
continue to make crop sensor bodies. There is a market and need for them. The 7D is one of the most successful and popular bodies that Canon has ever made and I see them twice in number over many of the other DSLR's.
Canon really has their work set out for them, it will be a hard camera to top. I love my 7 so much in fact that I really don't plan on replacing it until this one falls apart, regardless of what Canon puts out. It has done everything I have ever asked of it and more. Nothing currently (based on cost) is worth "upgrading" to. It's funny, I even keep a 40D as a back up to my 7. Love that camera just as much.
Don't take me wrong, I have shot FF as well as many offerings from Nikon etc... They are all wonderful cameras. But compared to the overall awesome image quality and brute speed of the 7 at it's current asking price, it is a VERY hard camera to beat.
In 5 years? Who knows what digital sensors will be like. Maybe low noise at high ISO will be a thing of the past, regardless of sensor size. Who knows, maybe all DSLR's will have the option of shooting FF, or crop sensor (H or C) with a flip of a switch. I know some do that already...
Hard drives went through a similar problem. Around the turn of the century, hard drive space was nearing it's maximum, using then-current hard drive technology (about 1TB). In 2005 Perpendicular Magnetic Recording became commercially available and now we have 4TB drives with 12TB drives being predicted being available by 2016.
You never know what tomorrow will bring.