Linux lacks the market share to make applications conform to Wayland

There are two problems with this reasoning. First, such applications might choose to not support Wayland at all, and drop the Linux port instead if Xwayland isn’t sufficient. Linux doesn’t have enough of a market share to force application redesigns. Second, are you sure that multi-window user interfaces with application-driven window management are never the best way to design an application, even if one only needs to support large displays and will usually have multiple monitors?