One other point on your post:
Yes, even in a "return to federalism" scenario, federal taxes would continue to be necessary to (1) pay for the PROPER functions of the federal government, and (2) clean up this egregious mess the Progs have created and now are speeding toward a tipping point.
However, if the federal government really did stop spending everything else it spends, and federal taxes were capped at what was necessary to do (1) and, gradually over time (2) above, I think you'd still see a HUGE amount of "new" money remaining in the hands of those who earned it and available for state taxation.
Yes, we'd still be paying for stuff, but if most things were done by the states, there'd be much more accountability. But the main thing would be that each state would be able to use funds from its citizens for its citizens and not be forced to pay for the citizens of another state.
So, yes, we'd have to keep paying federal taxes for national defense and national debt type stuff, but imagine if federal Social Security and Medicare (and now Obamacare) programs phased out over the next 40 years. That would be huge.
If there is any taxation at the interstate/federal level, it will be a foot-in-the-door that will lead back to tyranny. Let the states fund any legitimate interstate/federal expenditures, such as defense.