Originally posted by falconeye APS-C dSLRs will die out. Dead. Dead like can only be seen in a museum. You'll see analog film SLRs and FF dSLRs maybe decades after APSC died out and only really old people remember they ever existed. Dead enough for you?
Sorry, but I disagree with you.
Unlike some of the examples you have given where standardization is required to ensure interoperability, sensor sizes do
NOT need to be standardized. And for the majority of the consumer outside these forums, they do
NOT care about sensor sizes!
Currently, many sensor sizes coexist for digital camera, even for DSLR - 4/3, Foveon 1.7x, Canon 1.6x, APS-C, APS-H and FF; and many more for P&S. As lenses and accessories between different manufacturers, or even between different systems within the same manufacturer, are not interchangeable and compatible, each particular system can cater for their own selected sensor size.
There is only one scenerio where your prediction has a chance to be true - that is the death of the whole DSLR segment (e.g. completely replaced by EVIL/mirrorless system). I don't think that would happen though. But if that's the case, then the only surviving DSLRs left would be FF + MF to fulfill the niche, just like the vinyl market right now (vs digital downloads + CDs).