Just listened to Warren's announcement.

[Athene]

Warren's the only Democratic frontrunner I've come close to "feeling" thus far...But I honestly don't think she stands snowball's chance in hell at defeating Trump.
I'm not convinced that anyone else in the current crop of potential Democratic candidates stands a remarkably better chance at pulling it off either.

My god, is there really NO ONE ELSE who's willing to throw their hat in the ring? Because at this point, it seems that 2020 is staging to be another fucking disaster for the Dems.

I hope I'm wrong.

I'm not sure why you think chances are so bad. It came down to Pennsylvania, Ohio, Wisconsin, and Michigan in 2016. Trump barely took them. They are states that have gone blue more often than red in the last few presidential elections. If the nominee were Sherrod Brown, those states would be a lock. They would probably be a lock with Amy Klobuchar. With other candidates it would be less certain of a lock, but I don't think that Trump has held enough of his base to hold those states. Oh, and the long shot Richard Ojeda would probably also be a lock in those states.

Dems would have to sweep the Rust Belt while facing the formidable power of incumbency.
That's a fairly monumental task in and of itself. 

Brown's geography could help, but if the Dems candidate who can't manage to successfully connect with ALL segments of of the Democratic base, then they're done. I don't know if Brown's up to that or not. 

Has Brown even announced that he's running? If he's going to get in the game he'd better get cracking and announce his intent soon. Even among Democrats, most people don't seem to know who this guy actually is and just recognize him as that one senator guy who calls Trump racist.

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*Sigh.*...Must you make everything about "stinkin' SJWs and their damn identity politics"?
Oh, who am I kidding? Of course, you must. 

Biden's best chance at winning was in 2016 when he still had momentum. That has since been lost and Joe will pushing 78 years of age come election time. 
That's the real thorn in his side.

Not talking about SJWs, I'm talking about the democratic base.  They need a squeaky-clean, charming, intelligent candidate, or they won't get enough turnout to carry the election.
 

Only intellectual infants require squeaky-clean candidates. Rational people understand that such candidates do not actually exist. The Democratic Party simply attracts a much broader scope of demographics. Their challenge lies in successfully addressing various demographics' unique concerns and finding away to tie them in to the "greater good'.

The Republicans just need a guy who seems to want to make life hard for the democrats, and they'll get the votes they need.

More or less. 
I'll give you that, since it's as close as I've seen you come to making a sensible assessment all day.