A smack in the face. Here's what's going to happen. Biden wins, but not in November (the guy who wins in November won't be sworn in in January).
Biden then goes about the task of fighting off calls to investigate Trump and his administration. He'll hate this. He has his own agenda and executing that while trying to punish Trump would not only bring his own plans to a standstill, it would piss off half the county and basically be akin to a certain Southeast Asian ground war the US involved itself in in the 1960s and 70s.
Nonetheless, those fights trip him up. Biden is now stumbling as he starts his tenure, much like a racehorse bumped just out of the gate. Concurrently, all through 2021 Biden will likely still be fending off the accusation of influence peddling -- see Biden, Hunter et al. This will find he and his admin limping into late 2021 hobbled by internal discord, and tugged this way, that way and leftway.
Meanwhile, quietly undermining the whole enterprise will be anti-growth policies (tax increases, regulations) that will be a drag on the economy.
All of this is, of course, is exhausting. It would be a challenge for 35-year-old president let along a 78-year-old one. By early 2022, Biden will have had it. He will step aside and badaboom badabing, just like Bob's your uncle, Kamala's your president. This will bring San Francisco magical economics to the national level, with California's lousy dismal science practices not far behind.
Biden is an empty vessel, ready (and willing) to be filled with any noxious American-hating policies that the far left sticks down his throat. Biden doesn't hate the US -- he's become wealthy plundering it via influence peddling for almost 50 years. But he's not smart enough or brave enough to fend off the leftist hordes.
In fact, this admin will be so odious, so ferociously anti-American, such a failure at running the country, that this could be the last Democratic president in a generation.
Trump is an asshole of spectacular proportions. He's weapons grade. But he's an effective bulwark against the coming totalitarianism.

