I'll go a step farther, it only makes sense as part of a "PS Now" like service, where you pay a monthly fee and you get access to a catalog of games. Nobody is paying for locked-in games that only run on Stadia given Google's track record of goldfish-like attentions span on these projects.

If you are just renting hardware then you need to run a local Steam cache (this exists), and allow players to use their existing game catalog. This is basically the "GeForce Now" model.

And yes, you may note that I am referencing other game streaming services. Google is late to this party, and they have nothing unique to offer, nor a particularly compelling business model, nor the trust of their userbase. Stadia is DOA.

If Google wants it to be not-DOA with their current business model, nothing short of a guarantee that if they fold within the next 10 years then they will issue a full and unconditional refund is going to do it. Nobody is going to pay full price for locked-in games on a platform with a track record like Google's.

Sure, if you are the kind of person to sell and buy used games, that will probably be pretty cheap. But that's becoming more niche by the day, even without Stadia. Most game sales are digital downloads from a storefront.

That would imply that the purchasers of these games are not price sensitive and would negate the implied price advantage of Stadia.

I have an experienced software engineer's salary, few expenses, and yet... the cost of a whole console to simply play a couple of exclusives (when the vast majority of games are available cross platform and you already own another console or pc) is still too high, even though it doesn't hurt much financially, overall. It isn't an impulse purchase. And it makes you feel like a mark/sucker if you go for it - ~$400 for a video game or two or three is a rip off. And these days, they all have a subscription service you need to buy if you want multiplayer or game updates.

At the same time, I never feel compelled to penny pinch by selling/buying used games. And I like to keep them, as I'm sure many other people do. Time, effort and inconvenience is involved with used buying and selling, and for many of us, that offsets the value of actual dollar savings.