Right now we got a time that stopped right at the hour X. The hour of apocalypse.
Every kind of supplies is infinite, because if you ran out of them in one town or one military outpost, you can just move to another one, and there will be unplundered gun shops and everything you need.
Firearms are far more powerful than melee, and ranged characters dont even need to engage in melee, because with 5 skill they can do up to 200 damage per turn on every distanse.
Craft isn’t so nessesary to survival, because everything that you need you can get in another nameless town.
There is something that needs to be done. There is my simple example, maybe community can improve this idea.
Day 1. Everything is untouched, guns on their shelves, food in refriegerators, dogs locked in houses. There is A LOT of NPC around.
Day 3. Some of the shops are plundered (gunshops and grocery mostly), but not completely. There may be some rifle or shotguns left, but almost no ammunition. Most of the NPCs are dead, and you can find their bodies. There is no more not wrecked cars.
Day 10. There is only 10% chance, that shop will not be empty. 60% of gasoline pumps are out of order. Windows broken, zombie corpses everywhere, but there is still a lot of survivalists and military remains.
Day 14. In addition some of the military outposts, FEMA camps and bunkers are looted. There is only 20% chance, but…
Summer, day 1-10. Everything around is looted, cities are mostly burned down, 90% of gus pumps are out of order, destruction and desolation all around you. There is only a few mostly agressive NPCs around, and you are only on your own.
Hardcore summer suvival. Maybe starting season may be changed to fall, and in the beggining of new era of desolation there would be a message: “Winter is upon you.”.