Your defeatist d i ckheadism would even make Scooby blush. Think of the implications if Dems didn't impeach.
First you send an unmistakable message to whistleblowers that they won't be heard even if they go through proper channels (their dept inspector general who has to report to Congress). So, forget about anybody else trying to expose criminal behavior from the inside.
Next, Chump would now have carte blanche to extort any ally receiving US aid for help with his re-election campaign. Ukraine's leadership would be over a barrel and would be forced to announce an investigation into the Bidens. And if you think the lamestream media would have followed up on all of this, don't make me laugh.
Once this was accomplished Chump would continue to send corrupt sycophant Rudy Giuliani around the world conducting a shadow foreign policy off the books and out of sight. Soon you'd see foreign investigations of Sanders, Warren, Buttigieg, etc.
Contrast that to what has happened. Entire treasonous operation has been exposed. No "investigation" of Dem presidential candidates from foreign countries desperate for US aid will be taken seriously even by Beltway Bobs of the press corps. Giuliani is now a pariah who has a date with a prison cell now that his co-conspirators have flipped on him already. Republican party and everyone in it is now beyond a doubt part of a treasonous money laundering cult. Cory Gardner is a dead man walking, and McSally and Collins are in deep sh it. Furthermore, Chump's popularity remains underwater and 50% of the country wanted him convicted. Since he skated the entirety of the left, from Sanders to Bloomberg and everyone in between is now united to kick his fat arse out of office.
I know for some of you "Dems in Disarray" is a comforting meme. Try to make sure it actually applies before you use it, or you are as mindless as the Republicans!