Then you are sadly mistaken. Most invested retirement assets are sitting in IRA's and 401(k)'s, 403(b)'s, TSA's (why in the hell do we have to have so many %$^%$%plans anyway?). So your theory is kaput from the start. All of these plans would lose their future tax liability. The greatest windfall of the FairTax plan.
Not true - these assets would be taxed at the Fair Tax rate when consumed by the retirees, a rate that would probably be more than the retirement income tax rate.