These dire prognostications about a flat tax seem to come out of the woodwork before every presidential election. It is true that a flat tax would not be good for companies in the tax preparation industry, but we don't have a flat tax now, and if there's any credible indication that we will have one in the foreseeable future, then I have missed it.
The Flat Tax might be an improvement over what we have now, but it will never come to pass. The political parties would lose the ability to sell favors to the highest bidders. If that happened our politicians might not become rich in office. The potential losers are the ones who would make the decision. Sooo done lose sleep over a Flat Tax.