Just a couple of notes on K-12 public education spending, for additional context:
(1) The vast majority of the public funds go to teacher salaries and benefits. In most districts, as little as 5% of funds are available for new technology, pilot programs, or anything innovative. That said, small percentages can go a long way. New York City, for example, has an annual budget of ~$24 billion.
(2) Per student funding is a complex mix of federal, state, and local dollars. Federal dollars are designed to even the playing field, while local dollars exacerbate socioeconomic differences. The lack of transparency around these formulas is a significant barrier to disruption--many families don't have an accurate picture of how their school's resources compare to the resources of schools in the town nextdoor, which would be a first step toward starting to think about what your money should really be getting you.
Part of the reason the school choice movement has been so powerful is that it sheds light on per student funding. With the increasing number of blended/ hybrid learning options, I'm curious to see whether there's a push to give families even greater control over the per student dollars allocated to their children. If you can take your child's ~$10-13K and go to a charter school, why can't you decide to dedicate half the funds to online courses and half to live instruction?