In the category of “tectonic change” (yet one which would leave all existing institutions intact), there is this: “By Request: How to Transform the Society of any Nation (summarized in a ‘5 min read’)” here in Medium.

It is a different way of supplying the economy with money, one that would not involve debt. The supply of money would still pass through the banks, however. Given how much positive change this way of supplying the economy with money would guarantee (no unemployment, poverty, taxes, or public debt; more sustainability), how little change it would require is perhaps the most surprising thing about it. [For the record, I am its author; I do have an M.A. in economics.]