The problem is that the "avoid shelling $60+ each" idea continues to be a dream. Games are added only many months later when the first-week/month revenue well runs dry, and by then you'd probably find a good deal online. The gaming PC argument can work, but PC-based game-subscription streaming services usually end up running at mid-high graphical settings (OnLive did, at least), and you can build a PC nowadays to satisfy that at not a high cost. (But we'll see what Stadia ends up delivering)

The closest we got (if I remember correctly) was Darksiders 2 launching on OnLive at the same time as PC, but it was also a rental game rather than being part of their Netflix-style subscription PlayPack.