Whether or not something is a "pro" camera depends on whether it's being used to generate income for the photographer.
With that said, I see low end DSLRs and perhaps even low end mirrorless as going similarly to P&S cameras. Cameras like the Canon Rebel line and the Nikon 3xxx and 5xxx cameras may be better in a lot of ways than phone cameras and P&S/bridge cameras including image quality, feature set, and the ability to tap into their respective manufacturers lens lines(a new 120-300mm f/2.8 Nikon zoom works perfectly on a D3500). An APS-C sensor is inherently less noisy and has better high ISO performance than even a 1" sensor. With that said, they are bigger and a lot of folks who buy them never venture beyond the included 18-55mm lens. Some MIGHT add on a 55-200/55-300 or maybe even swap both for an 18-200/18-300 zoom(or may buy a kit that includes one of those lenses instead of an 18-55) but many people will never go beyond what's in the box with their camera.
Higher end cameras will always have a home, IMO, whether it's enthusiastic amateurs or people making money from them. It's hard to photograph a wedding in a dimly lit church with a phone or P&S, or get those exciting headline images of a football game with one. That's why if you look at the sidelines of a major sporting event, you'll still see big lenses on monopods.
The recent(ish) round of flagship DSLR releases like the Nikon D6 may be the end of the line for those, but the recent flagship mirrorless cameras will likely continue to be developed for the forseeable future.
As a side note, there's an interesting parallel that Nikons last and arguably best 35mm SLR, the F6, was released after DSLRs had taken over most markets. If you use an F6(I do regularly) you will find it less like an F5(its immediate predecessor) and more like an F100/D2 series mashup that sits at an interim size/weight between the F100 and F5 or D2. The first Nikon SLR, the F, was released in 1959, and the last, the F6, was released in 2002, or 43 years(and the F6 continued in production until I think 2019, or maybe 2020-whenever Nikon decided to stop making cameras in Japan). I don't expect a D7, and honestly from what I know of the D6 it's similar enough that it really could have been called the D5s. Still, though, they're likely stopping at the D6, and it took 21 years to get there(1999 for the D1, 2020 for the D6)...we'll see if something like a D880 comes out, but I'm not optimistic about that either.