When it comes to the general election here is what I think may happen.
50/50 if not better
If conditions allow for it trump may try to go the Marshall law route and indefinitely postpone the election but that will get slapped down by John Roberts and maybe Gorsich seeing as how he now has his lifetime appointment
But that will leave the door open for Governors like Kemp in GA and Desantis in FL, Abbott in TX , Iowa and Arizona are supposed to be close and have Republican , Trump wannabees as Governors so you can add them to the list as well all of whom after all summer long of not giving two shits about how many infections and deaths in their states because "the economy was more important"about the end of the 3rd week of October all the sudden "seeing the light" and "getting religion" and re-imposing "stay at home orders" and an open thing that will not be allowed is in person voting, and surprise surprise surprise it will be announced like the day after the deadline to apply for an absentee ballot so no the election itself will not "canceled' per se but if wide swaths of people who vote in person because they do not and never have trusted absentee voting IE Black people can not vote at all most would call that "rigged'
Other than FL all those states also have US Senate seats up
5 seats that could go D if Biden were to win in those states
But stay R if Trumps "wins"