I read it in the newspaper about their fears of hyperinflation. A country must have its own currency. Government steps that use the USD when hyperinflation occurs is just an initial rescue step but it seems the government forgot to educate its community that they will return to their own currency when it is stable, but how can they stabilized their own currency if no one use even in their country. The possibility of Zimbabwe experiencing hyperinflation is very possible when they cannot stabilizing their own currencies and what is worse is that Zimbabwe is on the failed list
I don't think that there is anything that is ever beyond the control of human, that is why we have been designed to have knowledge, it all depends of how we manage to use it. The USD we are taking about which they are using as the temporarily measure to control the inflation, it has its own problem also, and they will not continue to rely on it because it is a failing currency already, so if they fee in future their own personal currency will be okay, then they can out it to test and may not led to any hyperinflation.
Is that not why they have financial experts and advisers, so better they try to depend on themselves first and sort out their issue on their before they start thinking of external ways if that what fails. Maybe now, they will even start considering cryptocurrency too as an alternative.