That’s like asking “a hospital can’t handle patients?” with no understanding of the effects the pandemic (and specifically ‘mah raghts’ hillbillies) had on the healthcare system – and will for years to come as we recover. NO industry can handle a 50-fold demand, even for a day, without collapsing.
The numbers - a million in a day - are going to be absolutely absurd. I don’t expect it, I don’t predict it, but if traffic needs to be blocked on the way in to prevent another million people coming, maybe declaring an emergency is good to enable rapid mobilization and better funding for emergency services. If it takes days to clean up from the traffic, I wouldn’t be surprised.