Being Devils advocate here but maybe after all those atrocities occur maybe just maybe people will vote for progressive ideals which will propel us to greatness rather than becoming an idiocracy.
You're ignoring the main argument made in that post, which is that Trump would most likely elect a conservative justice and it would stay that way for decades. That is a Big Deal. If we elected Bernie or someone very similar to him in 2020, it wouldn't have nearly the same impact as it would now.
And to people saying that Trump doesn't like CU doesn't change the fact that there's no way a republican congress would approve a justice that could repeal it.