Earlier quoted context omitted.
The question is, if deaths going down isn't the end condition, what is? Surely there has to be some point soon where the legislature gets to determine the laws of the state again.
Ultimately: risk. Scientists can model infection and suggest whether it makes sense to continue restrictions or not. In fact, they do just that and executives like Governors consult experts for matters like this one. Risk can go down if: (1) much of the population becomes immune [after vaccination or recovery from infection e.g.], (2) treatments arrive that mitigate the impact of sickness, (3) some novel isolation eq…
Emergency powers are for emergencies. It is no longer hour four in the incident command tent with a map and radio. It has been, and it may be again. But the steady state "waiting for a vaccine" stage is not that.
The normal mechanisms of government are logistically feasible on the time scale you're talking about, which is years. I hope they will listen to the experts. It worries me deeply that they seem not to be headed that way. But "I disagree with the legislature" is tautologically not a justification for emergency powers in a democracy.
Testing and contact tracing are not novel.