They'll likely take the MS route and buy out major studios. Though the important thing for Stadia that would produce more sales are big name, quality exclusives. They need to present a real reason for gamers to specifically pick out their gaming product when there are 3 others on the market other than sheer convenience.
"We hold these truths to be self-evident - all men and women created by the, go-you know.. you know the thing!" - Joe Biden