If compatibility isn't an issue (I have yet to have any compatibility problems with my Steam Deck), I don't see why they shouldn't move to SteamOS. However, I fear a future in which people develop games on Linux targeted directly at SteamOS: I find C++ development to be far better with First party Microsoft tools (Visual Studio, MSVC, DirectX, DirectXTK) than on Linux. I vastly prefer Microsoft style APIs to Linux style APIs (DirectX over OpenGL especially, though Vulkan is ok), and I have yet to find a C++ development environment that I like as much as Visual Studio. With solution files, vcpkg, and project files native to Visual Studio, managing projects and dependencies has become a breeze in Windows. Comparably, few IDEs on Linux provide comparable debugging tools or good UI (CLion being the only one I can think of, though I personally hate most of Jetbrains' UI) and cmake is such a poorly designed tool and syntax to me, I would hate to have to deal with it directly than just having vcpkg manage the builds and dependencies for me (though I think vcpkg is compatible with Linux). I don't mind targeting Linux as a platform via Proton, but I would really hate to have to write Linux specific bindings for a game