In the list of 100 Items to Disappear First Coleman Fuel (propane fuel canisters) is number six, which leads me to believe it's a pretty important item, in the author's opinion.
I've published the link to the list many times, and so obviously, I think it's a good resource, but what concerns me about this list, and others I've seen, is the assumption that the "emergency" will be temporary, and then, things will get back to "normal." In the coming times, I believe this assumption will be an incredibly misguided one. In my opinion, we're not going to be climbing back up this slippery slope we're sliding down right now. When we hit bottom, we'll have what we have, and once the consumables are used up, they won't be renewed - at least in the form we have them today.
As such, I think a dependence on those things as an alternative is going to leave many of us sorely disappointed. The list advises that one can not have enough Coleman fuel, and if one intends to be solely dependent on one's camp stove for cooking, I would heartily agree.
Except that ...
At some point, no matter how much one stores, without the ability to replenish one's reserves, it will get used up.
And then what?
My advice, therefore, would be to enjoy the campstove, for camping, and rather than store up a bunch of propane fuel in tidy little (contents under pressure) canisters, make a more permanent, long-term solution.
Fire is the element that enabled man to advance as far as we have. It gave us warmth, which enabled us to expand our range from climates that can support a virtually unprotected body into more inhospitable territory (like Europe). It allowed us to cook things that are otherwise inedible, like potatoes (unless you're my eight year old, who eats them raw). It gave us light on the darkest nights, which enabled us to work longer hours. Fire is the thing that separates man from beasts, and the ability to control it is a uniquely human characteristic.
In modern society, we've replaced fire with oil for all of those things, but in our future, it's very likely that we'll relearn our dependence on this amazing element.
The key will be knowing how to make it. So, while Coleman fuel is good in the short-term, in the long-term, we'll need to have other resources and/or more skill.
In addition to the dozens of boxes of wooden matches I hoard, we have about half a dozen of these:
They are called magnesium fire starters, and all that's needed to use them is a knife, to scrape off the magnesium and to strike the flint, and some tender (dryer lint works well, but so do cedar bark shavings).
They aren't difficult to use, but it can be frustrating, and it takes a bit of practice. Like most things, it's better to get the practice using them now rather than waiting until not having the fire is an emergency.
Of course, if like me, you're lucky enough to have someone as highly skilled as Deus Ex Machina on your team, he'll light the fire, while you run and grab the marshmallows.