Also, mechanisms like L4S for high-fidelity ECN feedback allow for higher link utilizations without end-to-end QoS impact.
IPv6 reducing routing table fragmentation should enable reasonable prefix based peering, along with billing senders according to the used peering. We don't need fast flat rates, we need cheap bulk traffic and flat rates for effectively-not-oversubscribed bandwidth. Maybe with a way to roll over unused priority bandwidth at some multiple into the next billing period to count against that period's bulk traffic usage.
Also, no one asked ATT to lose billions of dollars by buying Time Warner HBO and DirecTV. Or Verizon with Yahoo.
But they wanted to chase that Comcast vertical monopoly dream. And it will never yield any utility for customers.
It should all be a utility, like water, gas, and electric. And do the one job, installing pipes (and upgrading them) to people’s houses and delivering the goods.