I think I would run out of batteries first.... only because I understand they have a shelf life whether being used or not...
I keep telling myself I have enough supplies to get past my break-even date, whenever that is.
We probably have enough juice, PG, VG nic and plain juice, concentrated nic, and flovorants to last a good year, maybe much longer. Attys and Cartos too.
As far as batteries go I doubt they will be unavailable unless there is a breakdown of distribution of goods (a potential if 1212 predicted extreme sun flare activity takes down communication systems that will disrupt distribution of many goods or terroristic events) so batteries will probably still be available. If some of our PV batteries become unavailable, but cylindrical cells can be purchased we can always build our batteries, similar to the custom 5v batteries some of us use.
Small solar panels can charge batteries. Generators can provide some electricity, as long as fuel is available. We can always rig up passthrough power to PVs.
I'm going to start "freezing" some PG/VG in cobalt glass bottles I have. It doesn't actually freeze at residential freezer temperatures. I'm now storing all of my premixed juices and flavorants in a small refrigerator that holds temp between 45-50 F so that should extend the life of the juices.
If worse comes to worse I'll plant some tobacco plants in a small area of one of my yards or even greenhouse. I'm thinking about doing that anyway in some raised beds; just a few for starters.
One of the things we stocked up on, for Y2K, for bartering and use, was loose bulk tobacco (and rolling papers) and vacuum packed green coffee beans among many other things. Believe it or not toilet tissue, too. It might be a good idea to build up a stock of PGA for creating tobacco juice, too and homemade flavorants from what we can collected in the wild or grown.
But if everything stays "normal" batteries would probably be the first vaping parts we would need to replace. A lot of our atty/carto stash are those we've moved away from to those we like better but they'll do in a pinch.
I want to get a "build your own atty" but it needs to be compatible with bottom feeders.
Alice