Why would that be, they can just buy it like anyone else? Buy it for today's exchange rates, hold it for how long you want, and convert then it back to pay the local bakery at any future date.
(Just like if they'd buy Euros or USD, I should add. Not as if this is a good reason for Bitcoin to continue existing.)
Buy it from who? Is there someone with a big pile of bitcoin (or whichever) and a huge desire for worthless paper?
You'd be selling crypto at a very beneficial rate for you and if you need to make sizable transactions in "worthless paper" within a fast enough timeframe anyway, it works out.
Right, but some transactions being plausible is a different scenario than bootstrapping widespread use.