I do expect that would happen over time (even to the extent that states would change their tax laws to align with the federal auto-calculated tax systems).

I support most systems that would take the burden and aggravation off the American public. I also worry that it would make it even more opaque than it is today. (I don't believe we'd have the current rate of taxation nor spending if we hadn't instituted a payroll withholding scheme and Americans had to actually save and write a check to the government each year.)