The thing with FOSS is, that market share matters to an extend, only. It's about support und continued development and financing that (or helping otherwise).
The strain on the FOSS developers isn't closely related to the market share. Ok, bigger market share, might help to better the financing.
But Linux does well with the current share. (Doesn't mean its devs do too.) Server wise Linux is already here to stay. Desktop wise... It's much better than years ago, I must say.
KDE, Pipewire and all the USB and bluetooth device integration is already pretty good. There are bugs and flaws, but nothing serious. Hardware support - I can't think of any hardware in my possession, that isn't supported.
All the office apps, browsers, development environments don't need Windows anymore.
Gaming? Steam will continue to nudge developers to release native Linux versions. Or proper wine configs. They have a steam hardware to sell after all.
Yes, the anti-tamper ring0 and virtualization stuff can't be easily emulated or virtualized, I heard. Or has that changed?
Anything else that needs Windows running natively?
Specialized software still needs native Windows? What about Adobe and the like? Tools without a fully featured replacement and no native Linux version. These might offer Linux support if the share increases.
