I genuinely don't understand this fear re: COVID.
Why would governors want keep gyms and restaurants closed post-COVID? What do mayors gain by forcing people to wear masks post-COVID? It's in the government's interest, as an institution, to open things up ASAP. They're hemorrhaging money.
The things I'd actually worry about -- using COVID to justify suppressing protests and speech, for example -- aren't happening even now.
The only way this theory makes even the remotest bit of sense is if elected officials are malevolent villains hell-bent on literally any arbitrary form of control even in cases where it undermines their own self-interest and happiness. Believe it or not, governors and mayors enjoy eating out, some go to the gym, and no one enjoys wearing masks.
I do believe there's a very real danger of emergency powers being extended indefinitely in general. But not in the case of health orders related to COVID. Because the powers being exercised aren't the sort of things even the most power-hungry person would want to enforce indefinitely. There's just no motivation to do so. And, for anyone not experiencing a literal and extreme psychotic break, lots of even completely self-interested incentives to get things back to normal.