While I'm not disagreeing, really, this is much like disarming the radicals who are conducting a prison riot then dumping all the guns in the common yard and letting the prisoners work it out. Certainly it stops the riot but you still have a bunch of armed prisoners.
The Iranian people are going to be left with a power void politically and lots of weapons likely including at least some, likely not much, of their nuclear research facilities intact.
It's not like they're suddenly going to be inclined to make peace with everyone. They're shia, most of the Muslim world is sunni. They're certainly not going to look at Israel as a friendly country. They're not going to look at the US as friendly either.
What the Iranian people are going to be is isolated in the world, likely missing some infrastructure/govt services, and rebuilding from being attacked.
We can't really expect a friendly country to emerge from this, can we?