The U.S. Congress should not and will not imprudently transfer our entire major government revenue from income tax to consumption tax in a single step. Those who advocate otherwise would effectively hinder if not actually prevent congress from passing any federal sales tax.
I believe that all democratic nations dependent upon consumption tax as a major revenue source also have an income tax. IMO that’s due to voters balking at unacceptable tax rates. If a gradual complete transformation (from income to sales tax) is begun and I’m incorrect, a complete transformation could be accomplished in approximately four years.
If all major nations that employ consumption taxes are correct, the transformation would be halted when sales tax increase approach an unacceptable rate. At that time USA’s income tax rates will be greatly decreased. Lesser dependence upon income taxes revenue would then be an opportunity to equalize the remaining income tax’s burden.