It will have to come from congress.Far from great is an under statement. And yes, it will be a major part of his record/how he is perceived. There was a general hope amongst many people that he would alter US policy in many ways, specifically with respect to civil liberties and foreign policy. And while we are no longer putting boots on the ground in ME countries, civil liberties are still being shredded; and let's not forget he OK'd the assassination of two American citizens.
Ultimately I think each president following him will get progressively worse on these issues as the power of the executive branch expands. I really don't see anyone on the horizon who will slow this train down.
But if people don't demand it, congress wouldn't act.