He opened the door, and I find it very, very unlikely that either side will close it after this. Dems and Reps will both use this to take control in ways that would have been unthinkable prior to Trump's first election. The only way to restore any measure of that trust would be to pass laws that prevent this kind of abuse, and there's no way that politicians will give up power they've gained.
Impeachment could be a check on his power, but impeachment is a kangaroo court with a political jury, so he would need to piss off a lot more Republican senators than he has.
A few presidental impeachments over unlawful acts ending in conviction would change future behavior. But it seems unlikely that we'll get there.
On the other hand, a right-wing Supreme Court may try to block any reforms that check the Executive. The Legislature's ultimate oversight power of the Exec is impeachment, and they have decided that no amount of corruption or crime or destruction should be checked as long as it "feels right".