But what we really care about is what the system looks like a decade in, after property values have massive changes. And what it looks like 50 years in, after cities have been remade to reflect the shift in tax costs. I don't think any modern day Georgist argue for "single tax." Remember that income tax wasn't in place in the US when Henry George started writing!
So any modern plan will Lokey include shifting tax bases, over time, to rely more heavily on LVT and less on sales tax and other regressive taxes. This will require adaptation and policy change over the years and decades, rather than saying ahead of time that they can predict the future with absolute certainty.