`(b) Rate-
`(1) FOR 2007- In the calendar year 2007, the rate of tax is 23 percent of the gross payments for the taxable property or service.
`(2) FOR YEARS AFTER 2007- For years after the calendar year 2007, the rate of tax is the combined Federal tax rate percentage (as defined in paragraph (3) of the gross payments for the taxable property or service.
`(3) COMBINED FEDERAL TAX RATE PERCENTAGE- The combined Federal tax rate percentage is the sum of--
`(A) the general revenue rate (as defined in paragraph (4), and
`(B) the old-age, survivors and disability insurance rate, and
`(C) the hospital insurance rate.
`(4) GENERAL REVENUE RATE- The general revenue rate shall be 14.91 percent.
Trees may always grow to the sky, but "unelected bureaucrats" haven't unlimited taxing power (in fact none at all) as that takes congregational action. But your assumption that the rate they get to specify will always increase as an additive amount that would increase the total FairTax rate beyond the 23% isn't justified as explained in the three posts above.