IMO,
1) We will not have a winner due to the enormous amount of mail in votes, etc.
But,
2) If Biden wins, not much will happen. Just a lot of hot air about how we are embarking on a new path forward.
3) If Trump wins, more civil unrest than we have seen in a long time. Riots, looting, etc. There will be thousands of calls for recounts, investigations, law suits, refusals to certify the results, etc. Accusations of election fraud, Russian meddling, Iranian meddling, etc., etc.
And, in either case, Covid-19 starts to fade away.