There are no obstacles to this today - except a vote in Congress and a signature.
Why hasn't it happened yet?
Because you have not made enough people aware of how much money can be stolen by the NRST, that's why.
Because people aren't stupid enough to want a huge Federal sales tax on top of every purchase of goods and services. There are only a few who want this to come to pass.
And the way the FairTax bill is written right now, people would have to pay higher taxes to their state and local govenrments too, because the states and local governments have to pay the exorbitant FairTax on every purchase they make (think road repairs, buildings, police and fire eqpt,...) and every non-teacher salary and fringe benefit. So not only would we pay the exorbitant tax on all the purchases of personal goods and services, but our state and local taxes go up 20% plus as well.
What a deal? Not.