Incendiary language by politicians is pretty much the norm in America on both sides of the political spectrum though. Trump's rabble rousing speech was in line with how he generally addresses his supporters, and while not in the least helpful in ensuring a peaceful handover, was hardly impeachment worthy. It's not like he told his supporters to take up arms and storm the Capitol. In fact, he specifically said they should act 'legally and patriotically'.
I think in the immediate aftermath of Jan 6, the Dems saw the opportunity to try to remove Trump from politics for good and had the impeachment gone ahead then, it might have had a chance. But a month later passions have cooled and Reps have reconsidered where their loyalties lie - they may not like Trump, but they sure as hell like his support base.
As for Trump? He's clearly re-energised by all this: 'We have so much work ahead of us, and soon we will emerge with a vision for a bright, radiant and limitless American future.'
Oh the joys that lie ahead!