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The last thing we need is Israel or any other nation deciding they want to be the new rulers of Iran. That will work out just as well as the US's involvement in Afghanistan or Iraq.
Let's hope that any regime change in Iran happens with as little bloodshed as possible and that the new regime actually represents the population instead of only some powerful (domestic or foreign) faction. Khamenei seems to have prepared for a run to Russia [1] together with 20 members of his family so let him climb aboard that plane and leave sooner rather than later.