It's not the same as Germany post WWI. They can and have devalued the currency several times (e.g., declared 1 million Bolivar equal to 1 Bolivar, for example). Their gas costs literally pennies, so no one will freeze and people can still drive. They have food shortage, but if England could ration its way through the blitzkrieg then Venezuelans can ration their way through sanctions.

You say "Venezuela is fucked" but this same story has been in the news for almost a decade now, and there has been no significant development, violent or revolutionary, other than the mass and mostly welcomed immigration of Venezuelans into neighboring countries. Their economy might not be doing more than limping along, but so long as people aren't starving or freezing to death it seems to me, the passive observer, that nothing is going to change there anytime soon.