I think that drastically underestimates the (american, at least) knee jerk opposition to taxes, discomfort with novelty, and fear of having to move. Why would anyone go from a place where they pay a flat percentage of the assessed value to this new framework?
Scenario: Your local town assessor hates $ethnic_minority and starts assessing everything in $minority_neighborhood at 5x its former value so that they get taxed to death.
Scenario: Your local town assessor hates rich people and starts assessing everything in $wealthy_neighborhood at 5x its former value so that they get taxed to death.
Scenario: Libertarian demagogue mayor decides to eliminate income and sale taxes, and this is his proposal to fund what few public services will remain (at a very low rate). It works, but having virtually no public services remaining has predictable effects and gets him thrown out of office. Rather than rebuild the old system (and start an interminable fight over the specifics in the legislature) the decision is made by the next administration to simply adjust the rate on the new one upwards by a thousand percent.
I'm not saying these are credible scenarios, but treat this like a novel where you've written the last chapter; What is the most plausible way that a polity got from here to there? It's a more circumstantial way of thinking - "How might this occur?" than planning hypotheticals, which work more like "How will I achieve this next year in our current universe using my own actions".
