multiplayer games that can run p2p on intranet will be even more valuable

Yes. Because you’ll have food, water, electricity to run a computer, and leisure gaming time during such a time.

When I was a kid, pre-internet, there was a “computer club” that was basically a massive pirating event held once a month.

TV and Amiga in the car, large room in a hotel in Dublin city. You set up and swapped cracked games with all the other people there, copying floppies. It was so exciting to little me.

I think its fresh water, food and than maybe way down the list, its single player games.

You’ll have better things to do with your time in an apocalyptic than playing video games.