I can't see any positive outcome for the dems, but you are correct in your statement. Up until now, the dems,(Schiff), has had total control of the proceedings. Pre-screening testimony in the basement, not allowing the rebubs to call witnesses, not allowing witnesses to answer some rebubs questions, lying about not knowing the identity of the whistler, not allowing all pre-screened witnesses to testify publicly, etc, has not been a good look to the majority of independent voters.
I believe Rush Limbaugh might be on to something with the idea that Pelosi could pull the plug and blame the dastardly repubs for being complicit in Trump's guilt. Since the repubs are not gonna "do the right thing" and vote to impeach, she cannot embarrass the country because the criminal repub party has become a cult; blindly following the most dangerous man in the world. This way, she thinks she can escape the corner she's backed herself into, and blame it all on the enemy. Trust me. Regardless of what they say, (MSM, dems, etc), they know that they have nothing. Not only this, but they also know that once the defense is in a position to call witnesses, and this false notion that the whistler is entitled to anonymity is put to bed, they,(dems) really are toast; maybe for a couple of generations.
As an example, the Sondland testimony is a perfect example of how Schiff and the MSM control the narrative, up til now. Shortly after Sondland's opening statement, in which he somehow left out the fact that he had a phone conversation with the POTUS, Schiff calls a recess, runs out to the press and before testimony can resume, the MSM is saying BOMBSHELL!, SMOKING GUN! etc. and then once testimony resumes and Sondland is exposed to cross examination, this happens:
