If they impeach, Trump isn’t through. If he is not convicted in the Senate he can pretty much ignore the House impeachment.
But the difference was Clinton was in the last few years of his second term. This is Trump's first term and I'm not certain how you run for reelection as an impeached president.
That is the main reason, the pubs have got to keep the House. This midterm is as important as the 2016 Pres election.