Steam has been releasing Linux based hardware and driving generic Linux support since 2015, if it hasn't been worthwhile for the last 7 years it seems an error to bet on the next new thing catching on this time before it's even released.
Even assuming Steam Deck (which is what I think you really meant) is an absolutely roaring constant success then they still realistically have a couple of years before it'd really be a significant chunk anyways. That's ignoring the whole premise of their other development, Proton, which is about running the Windows games on such systems anyways.
Even assuming Steam Deck (which is what I think you really meant) is an absolutely roaring constant success then they still realistically have a couple of years before it'd really be a significant chunk anyways. That's ignoring the whole premise of their other development, Proton, which is about running the Windows games on such systems anyways.