That honestly wouldn’t be very fun at all. It would turn the solution to every urban area into “Wait a while” and most of them will starve to death or scatter off in pursuit of prey, zombies aren’t smart enough to want to guard specific areas.
Same with places like the Rat Mines, just settle in with a bat at the entrance, wait a couple days and everything inside dies. Same for survivor camps, bandit camps, etc. Everyone scatters chasing food or dies