I am of the personal view that DX will be phased out as I have stated in various other threads.
I will pay $500 CDN (as I live in Canada) to the person who most closely guesses the "Date of DX Death" and wins the "Death of DX Challenge". The metric will be calculated for each participant and will be the absolute difference in number of days between their prediction and the actual date. If there is a tie, the first person who made the prediction wins. If you enter more than once, you are disqualified.
You can enter the contest by posting your predicted date, which must include the day, month and year in no particular order but with no ambiguity, in this thread. Periodically, I will update a list of entrants with the predicted dates in the order that they made the prediction in this thread. As the "Date of DX Death" approaches, the prediction will become easier, so in the interest of fairness, the contest is open to entrants until December 31, 2016 as defined by the date of their post in this thread.
Definition of DX: The current F-Mount camera (DSLR or not) with a DX or smaller sensor, as measured by area, which is basically the current system. If Nikon replaces it with a similar but non-compatible camera (probably because the mount is different), then DX is dead.
Definition of Death of DX: Certain products, though still manufactured by Nikon, are basically dead even if they remain as niche products. As much as I love them, AIS lenses are an example. Therefore, DX shall be deemed dead when there is no longer a DX camera listed on the nikon.ca website, even if they are still listed on other websites such as nikonusa.com. The logic is simple, if it is not popular enough to market to a market of 40 million consumers, it is dead. By this definition, all the AIS lenses except the 50mm 1.2 are dead, as this one is the only one available on the Nikon.ca website, even though six are still available on the NikonUSA website. And even the 50mm 1.2 is mortally wounded as it is only available by special order.
If the Nikon.ca website is no longer operational, then I will pick another website but in the interests of impartiality, disqualify myself from the contest. If there is any ambiguity over who the winner is, I shall disqualify myself, make a judgement and my judgement will be considered final.
My prediction is September 13, 2025.
August 25, 2015 revision: The original title of this thread was “Death of DX Challenge”. I am now changing it to “Death of F-mount DX Challenge”. This is not a substantive change as the new title merely better reflects the terms of the challenge in this OP.