Prepaid plans get lower priority on carrier infra, as do MVNOs typically. Postpaid/premium is getting premium transit, unfortunately.
If there is any disruption to be had, it is an MVNO that is plugged into all US carriers, as well as satellite offerings, with the ability to pivot around whenever a carrier tries to squeeze the relationship. Google Fi with more carriers and better customer support, Airalo, etc. This enables you to keep your number while the service underneath the account can shift.
Agree, that's the challenge, an abstraction where you maintain the flexibility without the deprioritization. I admit, it may be impossible due to the inherant limitations of the model. With that said, from your link, Google Fi gets a high priority designation on T-Mobile ("QCI 6 goes to all branded plans, both postpaid and prepaid, besides those with Essentials in the name. Google Fi has QCI 6 as well."), so perhaps it's possible.
The problem relying on prepaid/MVNO to save us, is that MVNOs still depend on the infrastructure of the big three.
So if the big three are able to set new [higher] price standards for their own customers, eventually they will increase wholesale rates for third parties piggybacking on the network. This will of course eventually trickle down to prepaid/MVNOs.
One of the many reasons why the Sprint acquisition was anti-consumer.
