There is a practical component to this. It is nearly impossible for most parents to drive 2-3 hours each way to practice 4 times a week. Hopefully 10 years from now USL and USL2 clubs will have their own academies to cover parts of the US that are not in MLS metro areas. We aren't there yet.
Oh yeah, I get that. But why not, say, give every team a second area of exclusivity which is away from any other club of a specific standard (fully professional/top two tiers/operates an academy/etc) and which each cover a roughly comparative geographical area and with, say, a guaranteed minimum 2 million people within each zone, and mandate that each club must spend a minimum of $1m (I pulled that number out of my backside to demonstrate the point) running a residential academy there which must operate at least from, say, u-12 to u-18 and have a girl's section too, with at least 150 players on the books (i.e. to prevent clubs from cooking the books to operate the academy without actually treating it seriously).
In exchange, the club gets any of those players to claim as HG, the same as its metropolitan academy, and gets to keep a certain amount of any transfer fee raised by the sale of any players, etc etc.
That whole example is just me making something up off the top of my head. It's not a serious suggestion, but it's meant to demonstrate that there are ways in which the US system can be adapted to ensure that a far greater percentage of the population has access to a nearby academy set-up which can therefore cover a much higher amount of the total population than the existing set-up.
It just seems so crazy right now that - in a country where professional football is growing, but where if it ever becomes ubiquitous across the entire country is not going to do so for another 10-20 years
minimum - the governing bodies are quite content to sit back and just go "eh, well when new teams pop up I guess they'll sort out recruiting the local youths for us". It's a bit like a country implementing a system where people pay can only pay their taxes via a smart TV function, and having the attitude of "well, half the population might not have a smart TV so I guess they get away with not paying taxes, but hey, in a few years everyone will have them so it'll sort itself out eventually".