They will have no console marketshare. Xbox is seemingly transitioning to a PC brand, and their hardware will run Steam and other storefronts/services including Microsoft's own. I don't think they're launching a traditional console that developers are required to support separately from PC.
Nintendo achieving 70% marketshare is possible if you disregard the active PS4 + PS5 players and make it purely about Switch 2 vs PS6 hardware. PS5 players' transition to PS6 could be VERY slow, and many of them may end up moving to PC.








