You people are insane. This pandemic has put the entire country on its knees and Republicans are going to get wiped out left and right. The entire party has covered for and enabled Trump since day 1 and they're dug-in with him now, especially Mitch.
Keep in mind the virus hasn't even peaked yet in places like KY, AL, and MS. Everyone thinks this is the second wave that has hit Alabama & other rural places this past week, but it isn't. This is still the first wave. NYC is not the entire country. The rural South is about to get completely wrecked by this thing, and everyone is opening up their states like a bunch of morons. McConnell and all of them will be held to account in November. This will be a toss-up plain and simple.
What evidence do you have for this? Trump's approval ratings have receded somewhat since the pandemic began, but they are still hovering in the lower to mid 40s, where they have been throughout most of his presidency. The Republican base is blaming Democrats and the mainstream media for what they perceive as an "overblown" crisis, and their staunch support for Trump has only been reinforced in the meantime. Moreover, current polls suggest that while Trump is trailing Biden, he is nowhere close to getting "blown out". Like I've said before, this country is too polarized for Trump to lose by a landslide margin.
I've also explained before that Beshear's victory last year in Kentucky doesn't tell us anything about this race, and McGrath is not the strongest candidate Democrats could have put up against McConnell. She'll be lucky to come within single digits, much less win. And if even "Generic Democrat" cannot beat McConnell, then nobody can. As of right now, this race is still Safe Republican.
Except actual data tells us that it's toss-up or lean-Republican at most.
As for the rest of your post, which is an opinion -- all I can do is remind you that unemployment is at Great Depression levels already, and the vast majority of the country hasn't been scratched by the coronavirus. It's only just now starting to ramp up in rural areas. In two weeks the numbers are going to explode and bring every state to its knees because of idiotic decision-making by leadership to open things back up.
As for what the Republican base believes? It's irrelevant. The base has shrunk so much it's not representative of anything beyond former tea party fanatics and neonazis. Elections are almost always decided by the middle and that's still going to be the case in November when the country resembles West Africa circa late 2014.