Well the bigger picture issue is that sure it sends a message to future Presidents that congress will vote to remove you if you commit crimes... but that's it. If you have your own party as the senate majority, they'll protect you, sweep your crimes under the rug, and on you go to another 4 more years.
I agree we have to try and do something but... I'm looking at it from a long term view, and a risk vs reward outcome. The potential risks and likelihood of realization are far more than the good outcomes: Chances of Trump not being convicted which then gives him a huge burst of energy going right into an election year, firing up his loony base, easily beating Warren or Sleepy Joe. That situation is far more likely than Trump getting convicted by Mitch & The Gang, him going to jail and becoming a national disgrace, followed by some 8 year long 'englightened period' where Dems control 2 of 3 branches and somehow undo all the shit Trump and the swamp have conjured up since 2016.
Even though justice might not get served to Trump specifically, we are better off just voting him out in 2020 and getting things back on track and treating this whole Trump presidency as a weird blip on the radar, instead of risking him using a failed impeachment as a campaigning talking point and pitting the left vs the right even more than it already is.
I mean Clinton wasn't convicted and the dude got his D sucked and cheated on his wife while in the most highest office our country has. Pretty sure that in general, most people would say BC is still portrayed as a "good guy" (even though that's probably questionable at best).