They are at best temporary. Trump is completely unable to do anything permanent because he simply does not have the ability. He believes calling people names is how you compromise to get something done. Even if he wins nothing will get done but that is what you will vote for.
Yes, they will be temporary until another Democrat gets in there to reverse them. That's the point. Trump is nominating hundreds of judges to replace the ones that get in our way of making change. If Biden gets in, his choices in justices will be pro-immigrant among other things.
This is why the Democrats are so upset with the wall. You are correct, they can get in and change policy, but they cannot takedown that wall. Again, when it comes to supporting or being against the illegals, you only have two choices, because voting third party is just throwing your vote in the garbage can.
Obama and Hillary both voted for funding for the wall. Obama deported millions. Obama was first with the cages.
Sure Just as Pelosi and Shumer did till Trump became POTUS then they decided the wall wasn't needed. Just the Dem way.