I 100% expect the Republicans (congress in general, really, but the Republicans are presently driving the bus) to do exactly the same thing to tax law that the Republicans attempted to do to the healthcare law. Which is to say, rewrite it to further benefit the wealthy and further disadvantage the poor and middle class.
What congress thinks is broken about tax law and what the poor and middle class thinks is broken about tax law are two entirely different things.
It's not that congress can't figure it out. It's that what they want has absolutely nothing to do with benefitting the voters who elected them. They serve those who write them checks, hand out lucrative speaking engagements, "think tank" positions, lobbyist jobs, property and stock tips/deals, etc. They care very little for our votes. They know full well that when disapproval of congress is high (86% in a recent election), re-election rates remain high (94% in that same election.) So until disapproval numbers for a bill hit really dangerous looking extremes (83% for the ACHA, basically everyone that doesn't drool all their waking hours), they pretty much do whatever they want, and what that is, as always, is fluff the wealthy.
The key to stopping them is exactly what happened with the ACHA: The media and the Internet need to repeatedly and in a way that cannot be ignored, put the information about what the the proposed revisions to tax law is trying to do to most everyone out under bright lights. If that can be done, it'll kill their tax agenda, which is absolutely guaranteed to be harmful to most of us. Just like the ACHA.
The problem with actual reasonable tax reform is that you're asking the foxes to voluntarily reduce their access to the henhouse. No matter what they say about it, they are thinking "LOL, as if." That's not just the GOP, either; the Democrats trade on tax leverage too.
A truly fair and simple federal taxation system is literally no more than a few pages of clear and simple law away. The same is true for any state or town. Likewise decent healthcare mechanisms. But we can't get there from here. The monied interests don't want that; and that means we're not going to get it. What we are most likely to get, if we're not vigilant, is something a good bit worse. Just like the ACHA.