So... given that the Iranian regime is not paying any heed to the experts, does this mean that the end of their regime will be because of their own arrogance and incompetence?
Like the American regime, maybe they will try to blame everything on someone else. Though I’m skeptical that ever works for long.
Unlikely. My country have been through this (at a whole country level, not just a single city) for two years. It sped up desalination projects. People re-adjusted to the lack of water. Prices adjusted. Lots of water is wasted and very little water is actually being used for drinking. At the end, the rain came and it coincided with many desalination plants starting operations.
The prime minister suggesting evacuations is probably political. It is much easier to adjust to lack of water than to move your home/job somewhere else.
I can't answer that, but for a long time, there have been predictions that water and foot shortages will trigger (civil) wars and / or mass migrations. Whether it'll be the one or the other depends, I think, on how free a country is. A non-free country will have a strong police / military force that may resort to deadly violence in the case of an uprising. A truly free country will vote the regime out. Somewhere in the middle it'd be said police / military that would take over.
For my uninformed take, Iran is not a free country, the US is somewhere in the middle but I don't think an insurrection against the current regime (which has been deploying the military to mass-abduct people) would end well.
Why posit arrogance when incompetence is sufficient?
Suffering of population creates a risk for authoritarian regime but not necessary ends it. North Korea is one of examples for this.