I think you're probably right about people flocking to open areas. Hell, the first weekend of the lockdown over here enough douchebags flocked to Snowdon to over crowd it. That's a mountain with it's own freakin' national park for godsake. How do you overcrowd that?
If you could somehow keep the cities locked down but open up the countryside and prevent travel between the two it could work but I've no idea how you would police that.
