Linux compatibility being required probably won't mean as much as DRM-free efforts to distribute games, open source efforts to create compatibility across platforms, and proprietary efforts like Steam's. It's more like, there is enough linux compatibility now for Google to bother.
I think Steam's approach is much more interesting, in that you own the hardware and you own the games and you stream from your device to your device without third parties mining your data.
Nvidia's approach is the most versatile, you own the games on a multitude of marketplaces, and only pay to use the VMs, and can sign into the marketplaces on your own hardware too.
In both Steam and Nvidia's offerings you will still have your favorite games in 3 years, while you will have paid Google enough for a low-end gaming PC and a hundred games but have nothing except another bill to pay to continue access assuming Google continue service.