I've been paying attention lately to https://www.blackmagicdesign.com/ and https://www.red.com/ They make video cameras which take interchangeable lenses, produce video and stills good enough to be used in feature films, and are relatively cheap (comparable to Leica and Hasselblad cameras from the film era.) They are positioning themselves to be successful where Nikon, Canon, et al are becoming increasingly irrelevant.

My Nikon DSLR is four or five years old now, but instead of replacing it with another Nikon I'm thinking about a Black Magic Pocket Cinema Camera. (https://www.blackmagicdesign.com/products/blackmagicpocketci...)

Video is the new still photography.