Do the kinds of people shelling out $60 for a game find the $500 console a big barrier?
It's probably possible to turn some of these people into regular gamers with a service like Stadia. But a lot of them won't buy many games, and those that do might bite the bullet and go out and buy a console, so probably not the best audience for a product?
There are effectively 3 consoles and it takes about a minute to set it up.
They don't strike me as common reasons to choose Stadia.
Which happens once and requires no intervention from the user.
The rest of the time it's as simple as take DVD out of box and put in drive.
If you meant "setup" as in literally just playing a game you've already setup, then sure, that can be fairly quick, but still not as quick as Stadia was.