I'm not going to speak of how things should be. I'm going to speak of how things actually are. And with the world as it is, moving forward on impeachment on this is 100% the wrong move for the Democrats. Here's why:
1. This will not oust Trump from office. The Senate is still controlled by Republicans and you're never getting enough on board to remove him from office. Absent something far, far, far more damning coming out, this wont be nearly enough. Think about it, if Trump supporters have been willing to stick with him through everything to this point, is this really going to sway them away from him?
2. By impeaching with no chance of removal, you're just weakening impeachment as a check on the President. The more impeachment is used as a partisan tool, the less respect it will be given as an institution and the less Presidents will fear it. Impeachment is one of our most important checks on Presidential power and we're already facing a trend of unsettling amounts of power being gathered by the Executive. Firing this bullet without a good chance of it hitting weakens a very vital check.
3. If the Democrats impeach over this, they turn a one time mistake of Republicans into the norm. Republicans were stupid to impeach Clinton like they did. Ever since the use of that power has been shied away from by both sides. If the Democrats impeach and fail to remove from office in what will be viewed as a partisan tactic, both sides will have done it so it can now be done at will. Next time you see a Democrat in the Oval Office and Republicans control congress, I expect we'll see another impeachment.
4. Trump supporters are Mongo from Blazing Saddles. As Gene Wilder says "Don't shoot him, you'll only make him mad." That's what's happening here. Running a constant negative publicity campaign against an elected official helps suppress turnout among their supporters. However, if you impeach Trump you're making a direct attack on him. You're not actually doing anything to hurt Trump, you're just making his supporters mad and mad people go vote. Impeachment is erecting a giant flagpole for Trump supporters to rally around.
Pelosi is many things but a fool is not one of them. She knows how the sausage is made and there's a reason she's been pumping the brakes on impeachment for so long. Unless Trump is found in bed with a dead woman or a live boy, you're going to have very little chance of removing him from office. Bringing impeachment and failing to remove Trump from office would be a disaster.
So wrap yourself in righteous indignation if you must. Rail about how the world should be. But the way the world actually is, you should be praying Trump isn't impeached without proof of something much, much worse and much, much more straight forward than this.