Impeachment in this tribal environment will ultimately be considered usurpation of political power and not because of the systematic destruction of the Senate rules/conduct under McConnell.
Republicans will not consider impeachment by a Democratic Congress legitimate.
Now that some Democrats have gotten a taste of scorched earth tactics, it will spread and we will see further destabilization once the young progressives get into power.
I have no doubt that if this apparent rapist Kavenaugh gets pushed through, there will be a 12 to 15 person SCOTUS packed by the Democrats.
Bookmarks