I mean like or hate Trump, and not that I think liberals have ever been accused of being pragmatic or logical, but:
The fastest way to get Trump out of office and or potentially Behind Bars is to get him voted out of office. Impeachment isn't going anywhere. But, what people don't realize about the Mueller report is that it centers on the idea that a sitting president can't be indicted. Not that the president was innocent by any means.
Mueller's not stupid. There's a reason why he farmed so much work out to various District courts and offices.
As Long As Trump is president, he's basically safe. But once he leaves office, it's a whole nother ball game.
I'm going to give the benefit of the doubt and say that some of these Democrats are playing to their base by pushing for impeachment. But the smart kids in class know that dog won't hunt.