It is way too early to measure the success or failure of Stadia.
He's being sarcastic (I hope).
Either way, too early.
The amount of advertising (every single youtube video for the last 3 months), and lack of any excitement amoung gamers, hardcore or casual, does seem damning.
The launch at least is a very clear failure. The product is hopelessly broken. By far my worst experience to date with a google product. They really should give everyone a full refund as a gesture of goodwill.