Also Biden ran for president twice and IIRC was never a serious contender in Iowa either time, so let's not make him into the Midwest White Guy Whisperer just quite yet.
If we're going to fantasize about some deus ex machina to save us from the current shitshow, it's more fun to talk about the pee tape.
I kinda view it a couple ways
1. If Biden had run in the democrat primary, he would have lost to Hillary
2. If Biden had run against Trump in the general election, he would have won
Basically Biden being able to beat Trump is a moot point because he couldn't beat Hillary. No one was going to beat her in the primary, in my view. This is NOT an endorsement of the idea that things were rigged, just the reality that she had the most establishment support, and I don't think Biden could have beaten her in the south where she has far more clout with black institutions (churches, organizers, etc). Yea she had all those advantages in 2008 too...but she lost to a historic politician who ran a perfect campaign. Biden is none of those things.
Biden has various interest ties, specifically to banking, but I firmly believe candidates overcome those things if they're likable/good at what they do. Hillary Clinton is incredibly unlikable and unrelatable to many people, meaning she has nothing to fall back on - you view her flaws first. Obama had clear Goldman Sachs ties, corporate ties, etc etc etc...nobody cared in 2008, and while more people cared in 2012 he still won with ease. Yes Obama is also a unicorn in many ways but you don't have to be one in order to overcome flaws and still win (W Bush 2004 comes to mind).
I don't like Cory Booker...but he's charismatic and likable enough to overcome corporate ties. So is Kamala Harris, so Chris Murphy, etc. And I think Biden is more likable than all of them, he would have actually campaigned in the midwest, he's not married to a sexual predator so it would be pretty easy to slam Trump on that shit, etc etc etc. And since he wouldn't have glaring flaws with working class voters (when compared to Hillary), his VP would likely be better for the base. Imagine a Biden Booker ticket for instance. Again I don't like Booker, but having a VP who can excite young+brown people would be a good thing.