> we could take care of everyone with disabilities 10x over with plenty to spare.

Yes, like the 40%[1] of Stanford undergrads who have disabilities. The greatest long term impediment to what you're suggesting is folks who don't need the help taking advantage of the resource distribution. It both massively increases the costs and sours those who have to pay into the system on the whole thing leading to a backlash.

If we could just solve this quirk of human nature, we'd be all set.

[1] https://fortune.com/article/rise-in-elite-students-seeking-a...