They are out for blood and want revenge for Trump's 2 impeachments, on Day 1 of the new Congress preferably. And even if they don't, Trump will make them walk the plank.
Even if voters can't recall all the details of Trump's First Impeachment (timely Ukraine connection notwithstanding), the American people are smart enough to see that Trump's role the Jan. 6 riot was impeachment-worthy, and that the whole GOP remains stained by failing to remove and bar him from future office forever at that point.
An impeachment of Biden would be more like the impeachment of Clinton - a big nothing-burger, minus the lurid sexual details which held the press's attention in that instance (but still resulted in big Republican losses in the '98 election).