This was clearly an admission that, given the political currents, not everything could be reformed at once.
A tactic of many antagonists is to "refute" the advocates' sound arguments because they don't achieve 100% purity with the objective.
For example, the argument that the FairTax is a unfair because every person should pay the same amount of tax. While I agree that every person should pay the same amount of tax, the end goal is to replace all taxes with user fees. It's just not possible to accomplish that in one fell swoop. Ditto for the prebate -- at the appropriate opportunity that will be phased out.
A tactic of many antagonists is to "refute" the advocates' sound arguments because they don't achieve 100% purity with the objective.
Which is often nothing more than an argument designed to retain the status quo without admitting to it.
But with the FairTax everyone does not pay the same amount of tax, but the same rate of tax. There's a big difference between those two things.