This Umair article makes some good sense.

Unfortunately, the USA has to balance ideals with political reality. More than a few Medium commentators have espoused the view that if an impeachment is passed in the House yet fails in the Senate, this might set up an anti-Democrat sentiment leading to the 2020 vote. There is a strong possibility that the prez, house, and senate could be dominantly R after the next election. Then what good will all the righteousness or moral high ground have accomplished?

Until the polls show that Mr. Trump is losing popular support, the argument that impeachment should not be pursued has a lot of merit.

The impeachment will be much easier done in November 2020. It is called an election.