lol smh lol. no. its not about "Marketing 101" lol go look at the stock prices for Nikon and Canon. both are around 5 year lows. this has nothing to do with product life cycle. it is plain and simple people are buying less dslrs over a pretty long period of time. And you are right Nikon and Canon arent going anywhere anytime soon but this is still a trend. so at what point in time does a long term trend become the norrn for you?
We have a short wait till the 7D mkII and Nikons D750. Let see how dslr sales skyrocket with these. I dont think they are going to sell very many of either. When sales do not skyrocket, maybe that would be a good time for you to start asking why then see andrews list.
Interesting narrative you came up with though.