Right now with Stadia being in early access (limited availability without base), the number of blades they need for the user base is relatively low. Google knows they need enough blades to keep people from having to cue up, especially for pro members.
It may not make sense for them to continue purchasing and building blades with the current hardware. If they have to buy new blades to ramp up servers in preparation for the launch of base, and next gen consoles around the corner, it would make sense to start installing better hardware.

It may not make sense for them to continue purchasing and building blades with the current hardware. If they have to buy new blades to ramp up servers in preparation for the launch of base, and next gen consoles around the corner, it would make sense to start installing better hardware.
