Hello fellow Doom Nightmare player. I think Stadia is not for folks like us who have tasted the fill experience on high end rigs.
It will instead, expand the audience to a lot of casuals who just want a little demon-slaying power-fantasy on a low difficulty. Nothing wrong with that, and it is a damn big addressable audience. Just like how mobile didn't "kill" any other platform, it just added a whole lot of candy crushers.