Think back 72 hours. How sure was everyone that the shutdown would go on for weeks, if not months? How sure was everyone that Republicans would dutifully hold the line and never leave Trump’s side, because his “base” was incapable of seeing reality? Until 24 hours ago, it seemed like it all might never end, right?
And then, all of a sudden, the cracks in the dam spread, and the entire thing burst. Things hit a tipping point, and all at once, what had been unthinkable became real.
All human systems are complex systems, and all complex systems exhibit nonlinear, non-zero-sum, emergent behaviors. All of them. Things are impossible one day, commonplace the next. So it was with the shutdown, and so can it be with impeachment.