What's most important here is not who wins the White House, but who wins the House and Senate. Strong possibility of Democrats controlling both Houses come Jan 2021. Then the issue of whether Trump is re-elected is moot. If that happens, he's done regardless. Right now, the polls suggest he has no chance at re-election. Nevertheless it is way too soon to be handicapping the 2020 election, particularly without knowing how many votes in the Electoral College will be under Russian control.
That's the biggest wild card. With McConnell refusing to pass legislation clamping down on election interference/foreign funding, you may as well assume they have access to the booths at this point.