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Valve appear to be testing ARM64 and Android support for Steam on Linux
(www.gamingonlinux.com)
Steam is a video game digital distribution service by Valve.
Steam News | Steam Beta Client news
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Issue tracker for Linux version of Steam
I have to assume they're trying it out, but we may never see x86 to ARM emulation run at playable framerates while maintaining the power efficiency for many of the 3D workloads the steamdeck can currently run (not to mention dx12->vk translation). For simpler games, sure, but probably not cp2077.
Maybe it's technically physically possible, but I don't think we're close to doing it. I think it would be easier for them to fund ARM+VK ports of new/popular titles, or see a battery density breakthrough.