It depends on what you would consider stable. I would install it alongside gnome for now and try it out. You can just leave it on your system getting updates while you use gnome and just pop in every once and a while. It's up to you if you want to enable cosmic-greeter and disable gdm for your login page, but if you want stability, just stick with gdm for now.
Linux will get multiplayer game support from those straggler game companies when people show the userbase is there. They will always follow the money. So if you stay with Windows the devs won't support Linux. So saying "I'll move to Linux once they support it", will ensure they will never support it.
My suggestion is to dual-boot for now and keep putting pressure on the game devs to support Linux. It's important to dual boot and run as many games on Linux as possible for now to show in the steam metrics that more people are leaving Windows.