Considering that for iOS/mac/apple platforms devs will probably chose xcode, and given the premium one has to pay for mac computers these days (justified or not, I'm not saying either), I fear the answer is no.
Most devs that do _not_ make native apple apps (e.g. web devs) do not need a Mac, so the market of devs that do not use xcode, that prefer a Mac and that are willing to pay for a proprietary solution, over other proprietary solutions, is likely not that big.
There are still a lot of web developers who choose a Mac even if they don't need one. Nice hardware running unix with a decent UI is worth a premium price to lots of people.
I think you underestimate how many developers are willing to pay for their tools proprietary or not. We know better than most how difficult it is to make software and so I think as a group are more willing to support each other financially.
Most devs that do _not_ make native apple apps (e.g. web devs) do not need a Mac, so the market of devs that do not use xcode, that prefer a Mac and that are willing to pay for a proprietary solution, over other proprietary solutions, is likely not that big.