Originally posted by monochrome I'm the one buying the camera I want.
And everyone that buys a camera is an individual as well. Mirrorless cameras have one benefit that DSLRs don't and that's extreme compactness, able to fit in a pocket. Putting an interchangeable lens on most mirrorless cameras negates that compactness benefit. The most useful compact mirrorless cameras are being given away for free with phones. That market is going strong. DSLRs have one benefit that mirrorless cameras don't and that's an optical viewfinder. So, if an individual buying a camera can accept one that is at least as large as the smallest DSLR on the market, and would like to use an optical viewfinder at least once in a while, then that individual will probably be happiest with a DSLR. Unfortunately for the manufacturers of DSLRs, most individuals in the first world who want a DSLR already have one, so the market for DSLRs isn't going strong.
Those are the only two exclusive features of DSLRs and mirrorless cameras; sensor and lens technology is interchangeable, although there isn't a pocketable MILC that can offer the IQ capability of DSLRs, so the compactness benefit of MILCs comes with a big caveat. Perhaps at some point in the future there will be a sensor compact enough to use lenses small enough for the whole assembly to fit in the pocket of tight jeans, while still offering the shallow depth of field and IQ that camera enthusiasts want; and if a manufacturer can somehow fit a free phone into that compact MILC, they might have a hit. But in the meantime, the MILC market is going to consist primarily of photography enthusiasts who will give up the benefit of an optical viewfinder in order to have something different from the existing base of DSLR owners. There were 3 million MILCs sold in 2014, so there is a market for them, but once that market is sated, it is highly unlikely that sales will remain at that level. Sony has already decided that it isn't worth their while to invest in growing their MILC business, so while a smaller player might differentiate itself enough to maintain a profitable business in MILCs, the war is over.