Here's the Thing:

Pelosi really doesn't have any vested interest in sending the articles of impeachment to the Senate yet.

Why?

Because Bolton wants to testify to Congress and other emails are showing up with new evidence and day by day more and more evidence is showing up.

Also, Trump just smoke screened the Congress by killing someone and almost starting a war with Iran. There is no one really that doesn't believe Trump killed this guy just to get impeachment off his back and that's all. Anyone who says anything else is obviously either lying through their teeth or isn't capable of Strategic Thinking in the first place.

So, Trump is now definitely in the position he spoke of when he said "I could go out and shoot someone on 5th Avenue and get away with it."

He just killed  soleimani and has so far gotten away with it. He has killed the 2nd in command of another nation "Just to smoke screen the American people to try to get them to stop asking questions about his impeachment." What's he going to do next?

Here's the thing:

If you want Trump to be gone Biden might be your only realistic hope. But, if you want to be a Circular firing squad like the Democratic party often is, then your candidate likely will lose and Trump will be re-elected.

Basically, from my point of view Biden and Trump are the only two candidates at present that could have any possibility of winning the election in 2020. This could change but that's pretty unlikely (at least at this point.

There are just too many relatively unknown candidates running in the Democratic party. Trump knows this too. His only serious rival right now is Biden.

So, if your rhetoric takes down Biden then Trump wins. At least at this point this is what is actually happening folks.