What "people" really want is a phone that can do everything a DSLR can do, and without having to change lenses. Ultra-wide to long tele, macro, and all at f/1.4 equivalent capable. Even a port for a larger flash unit if needed. When that day comes, and it might, then where will the DSLR be? It might still be around, because phones will not have an OVF, and there is such a thing as too small, with insufficient controls, and the ones there are too squintched together for the comfort of many users. Actually, most mirrorless models are already in that category, for my taste. And the DSLR user, who values the feel of a"real" camera will revel in the fact he can have a battery in the charger while he is shooting with another battery in the camera. Phones can't do that. To do both via a docking charger device for the DSLR, while possible, I think is a diminishing return for the investment it would take, and as has been said, the docking device has to be plugged in as well- just like a battery charger. As to the battery door seal, I don't know the science here regarding significant wear, but the main feature of a "real" camera is the ability to change lenses. With WR, there is none unless the lens has WR too. So by changing lenses, this would be subject to the same issue of wear on the seal anyway, battery door or not.
Last edited by mikesbike; 12-13-2018 at 02:01 PM.