Right up until your local customer wants to access Google, or Netflix, or something in Japan or Europe, or anything that isn't one of your local customers. Then you have to find peers who respect NN. And you have to build some connection to those peers.
Peering is expensive. A little ISP running out of a local data center has to find some other little ISP nearby and they have to build a connection between their data centers.
Building a worldwide network of such ISPs is very expensive. Sooner or later, the two little guys combine with each other, then with two others. And then you get exactly what we had in the '90s, which leads to what we had in the '00s. Unless you get very luck and get some superpower that builds out the infrastructure without losing sight of all that is good and right in the world, you end up where we are today.
Oh, and you have to get the masses to understand the issues and penalize cheaters. Good luck with that.