Sounds like a power that needs to be better defined in law.
First, I'm certain that Republicans in the House and Senate will instantly recover their love of free markets, small, local government, personal responsibility, and fiscal conservatism as soon as a Democrat president takes office. The resulting ideological whiplash will be ignored by the press in favor of trumpeting how the president is violating principles nearly sacred to the most important subculture in the USA.
Second, if Trump succeeds in squashing midterms and gets a third (and fourth) term, there really won't be any "future administrations". The USA will have an autocrat.
Third, this ignores the looming Trump dynasty. I know Don Jr is the usual favorite to succeed Trump, but my money's on Eric. He's a little smarter than he looks, and behind every successful man is a strong woman. He's got Lara behind him, and she's smarter than everyone else in Trumpworld.
Fourth, should we actually get another elected president, it will be because a huge tidal wave pushed out almost all Republicans. There will be major reworking of federal government, including regulatory agencies, and the judicial system. What used to be "norms" pre-Trump will be codified, preventing this kind of bullshit in the first place.
Similarly, a law re-asserting Congress' right to declare war. The not-a-war in Iran is not popular, and is probably already illegal. Clarifying that might get Republican support if we told them that it tied the hands of a Democratic President.
When I asked my Congressman about it, he said (very barely paraphrased) "We're gonna run on health care". Which sounds utterly incompetent to me.
My Rep is Lauren Boebert, who is famous, a Qanon, and absolutely incompetent. Let's circle back after primaries to see what changes.
I'm not worried about a Trump dynasty if there are fair elections, though. Whatever Trump has, neither Don Jr. nor Eric have it.
I think ditching Clinton would have been a fine thing to do, but I'm under no illusions that things would be even the slightest bit better today. Republicans have invented themselves a complete fake universe and no precedent matters.