That would be a huge surprise. This has been discussed for decades, and zero has been done.
Tax preparers, CPAs, Tax Avoidance investment vehicles, investment advisors, attorneys, tax havens, government tax collection employees, all would lobby against meaningful tax reform.
The Debt Commission under Bowles and Simpson recommended a very reasonable approach in their report. It got nowhere, but IIRC, Ryan as Budget Chairman proposed a similar tax structure. Some of the current candidates have also talked about a dramatic simplification of the code. Carley talked about a 3 page code which was simply silly. But getting rid of the numerous loopholes, credits and a lot of deductions while lowering rates is not only possible, but getting more and more talked about. Unless the Dems get trounced in November though, it's dead.