People are concerned if he wins again. I'm more concerned of the lame duck session if he loses. Best case scenario, he just denies the outcome and try some losing legal battles. Worst case scenario, he accepts his loss and tries to burn everything down on his way out.
If trump wins our classic democracy style governing is gone - for good or bad.
If biden wins our classic way of democracy style of governing will be fought for - with good or bad outcomes.
Political ways and means aside, climate change denial and non-action will be this countries undoing. We simply can not remain a world leader without taking action on our energy infrastructure. Other country's will continue to progress with cleaner, healthier more sustainable energy sources and systems. They'll have success and they'll gain power. The US will continue to degrade as some old fogey president(s) and friends/donors keep trying to shore up and even promote the fossil fuel industry for short term $profit.