Punington: Even if there's no detailed information on Stadia yet, what do you guys make of its announcement and promised features?
The most important, at least non-technical, information will be the pricing. Has there been any info on that yet?
Sure, if they can offer an eat-as-much-as-you-want gaming service for like 10€/month, it will really fly (for those who have good enough, unmetered, internet and don't mind not owning a license to their games).
If, however, they expect one to pay 60€ per game (as if buying it from Steam or GOG), and the only moderately-priced monthly subscription would be for some poor-ass indie games you can buy for a dollar or two on Steam and GOG, then I don't expect it to be that popular.
If they are smart, they try to couple the service with some other streaming services like Netflix etc., so that the prices would compensate each other a bit.
Anyway, I am not sure if you realized, but this is not the first streaming gaming service around. Have you heard about e.g. Onlive? It failed, and I think the main reason was pricing, it wasn't lucrative enough with their pricing model, which was pretty much as explained above (similar per game prices as on Steam and such for AAA games, and their monthly service offered only some older indie games).
Sony also got quite a lot of flack when people realized what kind of prices they were supposed to be paying in Sony's streaming gaming service.
Someone has to pay for all the computing power on those server farms which run the games, and that someone is the customer. This is not like Netflix or Spotify where there is much less computing power needed on the server farms, instead it is mostly just about transferring the content to the customers. That is why Netflix and Spotify can offer so much stuff for a moderate monthly fee. Offering RAM and CPU/GPU capacity on the data centers is always offered for a much higher fee than mere hard drive space and transfer speed.
The main marketing angle for this "streaming gaming services" appears to be that you don't need to have a powerful PC to play the games, but can play AAA games on a meager PC (low-end laptop), tablet or such. That might otherwise work except that... consoles don't cost that much. So just saving something like 200-300€ (the price of a PS4 or XBox One), is it really worth it for most?