If we're considering tax changed, I'd love to see a government run like a kickstarter. Government departments' role should be designing programs, estimate costs, and pitching the program to the public.

For taxes, the government provides estimates or recommendations on what a household would owe but its voluntary. You throe your money into programs that you want to see funded.

It could go horribly wrong, but so can centralized planning. At least this way the people are responsible for it either way.