I am going to finish reading that, but right off the bat I disagree with the first paragraph. No way they take 3-4 yrs to sunset. The pubs have all control right now and have to accomplish something so large while they have that control. Dragging it out one or more congressional elections, let alone possibly a presidential election, would keep the door open for it to get shut down.
Surely they know this, which is why many recent articles hint that congress is keeping their foot on the gas even though trump is asking them to take their time.