Should the IRS and the Department of the Treasury consider alternative tax systems, such as Flat Tax, National Sales Tax or “Fair Tax”, or Value-Added Tax as viable options for the US taxpayer, compared to the current Federal Tax System?

Federal Income Tax
Should the IRS and the Department of the Treasury consider alternative tax systems, such as Flat Tax, National Sales Tax or “Fair Tax”, or Value-Added Tax as viable options for the US taxpayer, compared to the current Federal Tax System?
What are the challenges and benefits of adopting and implementing each system? 10 minimum sentences