The certification process in these states is much more straightforward than in GA, in part because of the elections in 2022 and how the nutjob candidates lost their SOS races. Georgia is different because Raffensperger was removed as a member of the Board of Elections, thus has less ability to keep this nutty stuff from showing up.
But ultimately, the law isn't on their side... I'm not trying to downplay concerns, but people can't allow themselves to be demoralized by this **** either.
I don't think the general nature of the swing states will change much, but in terms of EC outcomes, I absolutely can see a scenario with Harris matching or (in the event that NC swings) exceeding what Biden did in 2020.