Upload & Sell: Off
^ I don't think Canon or Nikon cares about resale, as they don't profit from it. They're going to keep putting out incremental upgrades as long as possible. I'd say the bigger threat to professional shooters isn't the decreased resale value of their gear, but the fact that the gear gap between pros and hobbyists will continue to decrease until the Uncle Bobs are as equipped and empowered as the professionals. This, of course, benefits the camera corporations, but will only make business more difficult for folks who want to do this full time.