Nice idea overall but we are still a long way from realizing this dream. The first priority should be to increase adoption.
Dream of what?. It's indeed that not paying tax will be benefitable for an individual who doesn't want their hard-earned money to be taken from them but in other side avoiding tax also making the income of your country decreased hence the country can't offer facilities like what they've offered now. Avoiding tax mean contributing to destroying your own country
Exactly that's true but what do you think happens of most of the tax money lets exclude few developed countries other than them almost all country's governments are 90% corrupt most of the tax money goes straight into minister's pockets. Still bitcoin would only kill income tax as per OP its not the total tax a person pays so he will be still paying tax even if he doesn't pay income tax.