Maybe, but history suggests otherwise, that presidents generally enjoy a 100 day honeymoon period where they get a chance to get things done and set the tone for the presidency. After the 100 days, polls generally drop a fairly reasonable margin and continue for a while. Then adjust to a margin baring major events.
I am not sure Rump has the ability to get tax reform done. He was unable to repeal Obamacare, something the House was able to pass numerous times in the years before Rump came to town.