Water shortage issue will be the one which topples Iran's regime. Many protests in Iran recently have been about it. Trump made a secret deal with Bibi. They agreed to move u.s embassy to Jerusalem and recognize it as capital of Israel if in exchange Israel helps them to topple Iran's regime. Toppling the regime also benefits Israel because it stop their nuclear development.
So how is Israel helping? within last 2 weeks Bibi has released 2 different videos where he has praised the iranian people and that's certainly rare coming from Israel when you think about the history between these 2 countries.
2 weeks ago Bibi released a video, where he mentions how good the iranian people are for inventing stuff and being founders or CEOs of numerous amount of successful companies such as Dropbox, Uber, Ebay and many more. He says all of these iranians had to move to u.s because the regime controlled Iran is poor, has big unemployment levels, tons of corruption, uses all their wealth on nuclear development, wars around the middle east and so on.
https://www.youtube.com/watch?v=e48YzZf1gGA
a week ago he posted another video, but this time he offers a solution to Iran's water shortage problem. The solution is about Israel's cutting edge technology to recycle waste water back to drinkable water. He says Israel already recycles 90% of its waste water. They will launch a farsi website where this information will be shared to the people of Iran. With this information, not only do they know how to recycle their waste water, but it will also show farmers how to save their crops.
https://www.youtube.com/watch?v=1qZORdDEc3Q
If I wanted people to turn againts their government, this is how I would do it. It's no wonder Q is so confident about toppling the regime.