The tax code is used to punish your enemies and reward your friends. Nobody in Washington wants to give that power away.
If he gets something close to this passed into law he will turbocharge the economy and assure his reelection.
That is, as long as he gets back to deporting more illegals as promised, too. And appoints another conservative to the SC this summer. Even continuing to kill our healthcare system will take a back seat if he can get the cuts, a true conservative to replace Kennedy on the court, and a real crackdown on the illegals currently in the country. Those three moves will make his presidency and legacy.