The biggest obstacle that prevents humans from doing anything is their own culture. Resources can be found if there is a will.

Here is no different. Many people hate the very concept of public education, let alone throwing more money at it. And when people do agree that we should do it, they inevitably disagree on the hows and the whats.

The issue with scale isn't logistical or so... metric based. It is as simple (and insurmountable) as getting such a diverse population to agree at all.