They may or may not shut everything down, but they will use one of the variants as a reason for mail in voting. If there was a free and fair election, the left would be slaughtered and it would be game over for them. So, this is a hill they will die on.
I think you’re more likely to be correct. In either case they’ve already marginalized their political enemies.
“We wouldn’t need mail in voting if you conspiracy theorist would get vaccinated. You’re getting people killed and now you want a say in how we have to vote?”