If I have my way, all of it will get invalidated when it becomes apparent that he is an Unconstitutional POTUS, a man who has usurped the Office. Nothing he has done is either legal or legitimate.
That means literally EVERYTHING he has done, disappears the instant he is removed from office. If it is done properly and LEGALLY that is. We shall see if the congress critters, party bossed, SCOTUS FINALLY do the right thing by the constitution. If they don’t that TELLS us something. And THAT is 100% NOT good. That would mean we don’t have any form of legitimate government other than the states.
I suspect you are right but if so it won't make much difference, I fear. Those controlling the federal government control a multi-trillion dollar enterprise armed to the teeth which controls the richest piece of real estate on the planet. They are not about to give that up over such piddling little details as "Constitutional legitimacy".
Probably in the end, a really serious challenge to their power would result in some sort massive crackdown or bloodletting by them and their surrogates - or might even result in outright civil war. That is, I think, one main reason why so many in the timid GOP and the courts seem so feckless and fearful about challenging the entrenched Liberal establishment.
These are tyrants at heart and tyrants mean business. They are usually more than willing to drop the velvet gloves and release the hounds of hell to stay in power. In the meantime, plain old intimidation and bribery of every sort has worked wonders keeping them at the reins of power in this country for years. Hopefully, that will end soon and this might be just the crack in the dam that starts their collapse.