The following complications either didn’t exist in 2001 or weren’t as severe then as they are today:
Polarization: Today’s two-vote Senate GOP majority is technically larger than the zero-vote Senate GOP majority in 2001, when Vice President Dick Cheney served as tie-breaker, but multiple Democrats voted for the first Bush tax cuts. It is a safe bet that fewer if any of today’s Democrats will vote to help Trump cut rich people’s taxes.
Preparation. Bush-era Republicans made cutting taxes their top priority. They thus kicked off a budget process in the early weeks of his presidency that allowed them to circumvent a filibuster of tax cut legislation and, if need be, pass it with Republican votes alone. By trying and failing to repeal Obamacare before addressing the broader tax code, today’s Republicans will enter the fall without a process in place to avoid a Democratic filibuster. That means that before they do anything, they will have to write and pass another budget, which is a tall order in its own right.
Calendar. But they don’t really have time for it anyhow, because they spent the spring failing to pass Trumpcare, and the summer on a lengthy recess. When they return in September they have to, among other things, increase the debt limit, pass annual spending legislation to prevent a government shutdown, reauthorize a children’s health insurance program, and most likely pass a supplemental spending bill to fund the Hurricane Harvey recovery effort. Which brings us to the fact that . . .
There Was Just a Massive Hurricane and a Biblical Flood. There is perhaps no better distillation of Republican thought than mounting a political campaign for massive millionaire tax cuts in the midst of an enormous natural disaster, but the public at large isn’t nearly as monomaniacal about cutting rich people’s taxes as the Republican Party is. To the contrary, cutting rich people’s taxes is very unpopular. And the dissonance of trying to funnel money up the income scale to rich people when it’s needed down the income scale for hurricane and flood victims won’t be lost on the entire public.