Those 30k people will be much less within only a few weeks. Most people dont have enough food, or water to sustain more than a week. They also dont get the concept of rationing.
Add in that the population number includes alot of people who require medical treatments, and medications to keep themselves healthy. Some conditions will quickly decline without medication and/or a very specific diet that cant be maintained when you dont have options like a grocery store and pharmacy.
The knowledge and experience of hunting and foraging is lost on aloy of society today. People have gone soft here with the availability of packaged food and meat they never had to kill and process.
Average people wouldnt even know how to create a fire without a Bic or a box of matches.
The elements will eliminate a good portion of people
Common illnesses that would normally be treated quickly and easily are now deadly or incapacitating. They will also spread quickly.
All of this plus the violence of desperate people will decrease the population so much that i really doubt the wild game population would take a huge hit.
