It is certainly possible that some future republican president would refuse to enforce environmental restrictions enacted by congress or refuse to enforce the voting rights act or some of the restrictive labor laws or other laws that are so dear to the hearts of democrats. I am not sure they would be given the same level of protection by congress however.
While our constitution set up a clear division of powers, there is no real protection against a rouge president when hyper-partisanship and a divided congress exist. As much as democrats like to hold President Nixon out as an example of official corruption, it was members of his own party who forced his resignation by refusing to protect him from the consequences of his actions. So far, not one democrat member of the House or Senate has exhibited the courage to place respect for the constitutional framework above partisan support for this particular president. Republicans alone can’t solve the problem and democrats don’t seem to care.
The 2012 election was a prelude, an introduction to future elections that will be a mere formality, a hat tip to the traditions of our once free republic. Romney wasn't supposed to win, he was window dressing. All 2012 did was condone a criminal government.
Sweeping executive powers will never be allowed in the hands of a conservative president. Neither the rinos nor rats will stand for a president Ted Cruz.
On the other hand, Clinton had the full support of the Democrats during the Lewinski scandal, or as I like to refer to it, the obstruction of justice scandal.