True. But almost all European nations use the input only, hence 'Value Added'.
You'll see Satan in a peacoat and muffler before that occurs, and in any case, the anti-Europe animus in the US is far too pronounced among the electorate (not necessarily among the soi-disant ''elites'') for any politico to even suggest such a concept.
Agreed, however, that some flavour of the IRS will still be required...but one can hardly imagine that a successor organisation, in a flat/fair tax regime, will be anything nearly as obnoxious and power-mad as the current ''service''. In a VAT regime, all bets are off; the enforcement organisation could EASILY be as obnoxious as the IRS; consult the Inland Revenue people for details.
:^)