Dispersal has to take place. For example if a territory was trapped out, it would remain empty if there was no dispersal.
Studies have show that unoccupied territories are quickly repopulated as a result of dispersal.
I know of a high fence properties that snare ridiculous numbers of coyotes every year. That would be possible with continual dispersal.
"The recreational value of a head of game is inverse to the artificiality of its origin"
"No prize is greater than the effort taken to acheive it"
- Aldo Leopold, The Father of Wildlife Management