People are paying for low prices with their time waiting in line. We are a long way from getting it done. Tax policy is something most people don't like to think about. The existing system has a tremendous amount of staying power. There is vested interest, but the biggest barrier is habit.
Politicians say the best tax is an old tax which is familiar and accepted.
There is a conservatism among folks that we know we can at least survive with the existing system, so why start wild experimentation. Tax shifting is different. The first thing we need to remember and communicate is that there is nothing about the tax system that is pre- ordained. It helps to tell people a bit of history. Take for example the history of U.S. corporate income tax.