The end of DSLR cameras has been coming for some time. Manufacturers have been slowly phasing out their DSLR lens lineups over the past few years and I don't think Canon or Nikon are making that many DSLRs at this point. At some point it won't make sense for them to keep the lines around and the stock will dry up.
It was clear around the time of the Sony A6000 that mirrorless would usurp the DSLR in the near future, that camera had already matched much of the performance of the high end cameras. Once the lens lineups were fleshed out more and the autofocus was applied to full frame there was little reason to buy into the older systems.