Just to add my 2 bit coins to the conversation:
I think if DSLR's are going out of business, Canon and Nikon have only themselves to blame. Lack of innovation and lazy development cycles has not gone unnoticed by consumers. When the t3i, t4i and t5i are essentially the same exact camera with minor tweaks, what is the motivation to upgrade? Same could be said with the 5D2 and 3, I have too many friends with the 5D2 who don't feel any need to upgrade to the newer camera since the benefits are relatively minor all things considered. I suspect the 7D will follow the same path.
If Canon really wanted to see an upward swing in sales, they would need to be more aggressive with the technology. Imagine if 2 years ago the 5D3 had been announced touting a 36mpix sensor, built-in wi-fi, oled screen, 4K mjpeg and 2K raw and priced competitively? It would have sold like hot cakes.
Apple is running a similarly dangerous game with their new Mac Pro. $3k for a 4-core Xeon with 12gigs or RAM and no internal expandability? WTF??? Next year they will shut down their whole desktop division claiming that consumers are no longer interested in big computers...but the truth is that consumers are no longer interested in being ripped off.
When I travel, all I see are tourists with DSLR's. They see the difference in the photos they take, the depth, realism and faithfulness of the images they show their friends back home is palpably better than what current smartphones or pocket cameras are capable of. I think the interest is there, but not at a premium price for basically the same technology from two years ago.