(1) Kill the subscription
(2) Immediate Priority: Biz-dev deals, make sure every major release's early demo is available on Stadia. Expose people to platform without requiring them to switch from a console.
(3) Secondary Priority: Focus SDK development on indie developers. Offer generous streamed minutes for all developer accounts. Charge per streamed minute after that. Let developers pass on the cost however they want.
With open pricing, open enrollment, open SDK, developers could do really amazing things with Stadia: and would figure out the business model.
Google could focus on driving down the cost per streamed minute as low as humanly possible, with the broadest possible access.
Amazon certainly will.