I'd say while it's possible it's unlikely, remember that they're running PC games, all based on X86, the work needed to make Wine/Proton run all of that well on a different CPU set is significant, and would likely break compatibility in unexpected ways, effectively bringing all the recent wins moot and bringing Proton backwards. Definitely something that will likely happen, but more of a long-term goal (unless it's already in progress and with advances, no idea, but we would all have heard of it already if it was a thing)