You may be correct. But this might be a unique situation. Trump's exposure of the deep state to even people who don't pay attention to politics, might be the difference maker that helps remove one of the pendulum's most left leaning springs to make it harder to swing back left as much as it used to.
Assuming, of course, the vote fraud doesn't prevent Trump from getting back in office.
As for Overton windows, I might hope that the extreme bias of the Fake News and the illegitimacy of the medical establishment have been exposed, anyway. So the windows may have moved “to the right” in these areas.