Executive orders have been overruled by Supreme Court decisions and Obama has not set a precedent.
The USSC has overruled President in the Past. Federal Courts Judges have overruled Obama...and have held him in Contempt of Court....yet this has not stopped him from continuing to violate both law and Constitution.
What is unprecedented is how and to what extent Obama has used Executive Privilege and simply by-passed Congress to do whatever he wants. By 'Setting Precedence', THIS is what I mean. SHOULD Trump, or any other GOP President, step right into office and begin blowing Congress off and doing whatever he or she wants they will be within their 'Liberal Precedence Setting' Right to do so, and any complaints by Liberals, as I mentioned will be a sign of both their hypocrisy and admission that what Obama did was wrong as well.
Republican Party in congress has gotten his agenda passed, not some kind of dictator like imagined power. Congress still holds the purse strings and that will always limit the President's power.
While the Republican Party has HELPED pass Obama's and the Liberals' agenda, they can NOT be blamed - which is something Liberals and Obama have proven they always want to do (blame others). It was not the GOP that rammed the minority-supported legislation (ACA) down the throats of the majority of Americans who opposed it, for example. And while Obama did not force the GOP to forfeit the Constitutional Power authority to ratify a Treaty, Obama DID violate the Constitution and by-pass Congress by declaring the Iran Treaty to be a 'deal' (NO Such Thing) and conspiratorially going along with the GOP in violating the Constitution so that only a MINORITRY of Congress was required to ensure the Iran TREATY was imposed.
Most of the things you mention Trump will be able to do will get knocked down by SCOTUS. He can not instigate policies they have already ruled as unconstitutional.
Much of what Obama has done has already been deemed Un-Constitutional as well; yet he has gotten away with it. The Iran TREATY, again, is a perfect example. The Constitution specifically states a 2/3rds majority is required to ratify a Treaty; yet Obama used the 'Bill Clinton Definition of the word 'Is' ' B$ to declare his 'deal' was NOT a 'Treaty', which is simply a LIE and an act of Violating the Constitution by By-passing Congress' to secure his 'Legacy'.
You can argue and deny all you want, but I challenge you to list in the Constitution where a President can make such a pact with SEVERAL nations, involving all that it does, call it a 'deal', and requires only 1/3rd of Congressional approval to impose it. Such a 1/3rd minority decision goes against EVERYTHING established by our Founding Fathers in this system of government.
Obama's EPA has no Constitutional authority to by-pass Congress to create and impose new laws, but they have.
So as far as I am concerned, should a GOP President step in and start doing the same thing Obama & his administration has done all the Liberals who defended Obama doing so can just STFU!