{sigh}....do we have to do this again?
There will NEVER EVER EVER EVER be another US President impeached in any of our lifetimes. Bill Clinton bought them all lifetime immunity by calling the bluff of the GOP Congress. None of them will EVER have the guts to actually pull the trigger (unless it is a Republican President with Democrat super-majorities in Congress...then there’s a shot)
This may not affect your argument, but Clinton was impeached. They wouldn’t pull the trigger on conviction in the senate, not impeachment in the house. You may be right that the failure to oust him from office dooms all attempts at impeachment for the foreseeable future. But at least they went so far as to blot Clinton’s reputation by impeaching him, even if the history books will only redound it to his credit.