I can make a much better case that the prices would stay the same than you can make for prices dropping.
Try it. You'll do something that no one else has been able to do, but let me tell you this. . .
To me, it is more important to drive a stake thru the heart of the IRS and the Income Tax than what the net effect is on prices and rates.
I am convinced that prices will fall immediately and that the FairTax rate will continue to decline over time. I know that my taxes will go up and I'm willing to pay that price for the greater good. To me, it's worth it.