The president is duty bound to "faithfully execute the Laws of the United States." That includes the laws that he or she disagrees with.
Your proposal that the president undermine the law (rather than faithfully execute it) would suggest that you are comfortable with the idea of electing a dictator.
FWIW, Bush and Obama have both failed to execute the immigration laws. I would think they should both have been impeached for their dereliction of duty and the violation of their sacred oaths.
Obamacare is 2,000 pages designed to spawn thousands of pages of ‘administrative law’, written by the executive branch.
Obama reelected = socialized medicine written into law by his HHS minions.
Conservative elected = socialized medicine repeal signed by the President.
Your creation of strawman arguments that lower the President to the level of a clerk is unbecoming and complicates that simple reality.