Once subpoenas get issued, and folks are under oath...Shiffy’s team will have a member or two who collapse from the pressure and admit that they kinda wrote part of the dossier themselves. At that point, impeachment-wise, it’s a room full of elephant-dung. It might still forward but they just guaranteed a Trump-win in November of 2020, and a huge plus up in the House and Senate.
Stupid Democrats are their own worst enemy.