That particular way seems extremely unlikely, at least in the case of Bitcoin. It was specifically designed so that it should be impossible to dilute the currency like that. Nobody is supposed to be able to directly control the supply of BTC, and the rate at which new BTC is created is steadily decreasing toward zero.

So going to zero in that particular way would presume that there's a vulnerability in the protocol that makes it possible to manufacture effectively unlimited bitcoin outside the normal channels, and that nobody is able to figure out a way to defend against it.

Its good that you are bringing this up. Bitcoin is entirely resistant to this, which can be demonstrated by the fact that Bitcoin is supposed to be popular in Zimbabwe.