IMO you have missed the target.
The issue is not the continued existence of a bureaucracy (IRS).
The real issue is the amount of power that Congress will lose.
The tax code is no longer based on what is necessary to runt he Republic, as our founding fathers envisioned.
It is now a system of rewarding selected sub-groups, forcing actions upon others, and shaking down still others for reelection contributions. Who benefits the most from the existing tax code? Congress. And it is Congress who will have to scrap the existing tax code for another.
What? Give up all that power and money? Are you serious Senator Cruz?
Yes, you’re right, of course.
My answer was the brief version; I suffer from typing-phobia.