One of my friends doesn't shoot any of the above.... or anything else either . He still has a 0 shutter count Canon 30D sitting on his shelf.
Does he have a camera phone
Or just no interest in photography
More seriously, although the above is a true story, I know a lot who shot sports, wildlife, landscapes and people.
This is the interesting part, how much is a lot
1% 0f the photo population, 10% of the photo population
I have no idea.
Below is the quote that started the conversation.
Trends and fashions change. It is very possible that after a few years of playing with small mirrorless cameras, Asian customers, especially in China where the economy and middle-class is still growing, will trade in their little mirrorless toys for "big boy and girl" DSLRs. Like customers in Europe and the Americas, they may find that if they want to shoot sports, wildlife and birds it's a lot easier to do that with a DSLR.
Most people tend to stick with what they are familiar with. Few iPhoneographers will step-up to mirrorless. Few mirrorless users will step-up to DSLRs. There are people who successfully shoot sports, wildlife and birds with a mirrorless camera. I doubt that a lot of them will step-up to DSLRs.
His use of " ... little mirrorless toys for "big boy and girl" DSLRs."