So you all basically think sanctions are going to work and the hardliners are going to cave in and agree to a new deal and not try to crush dissent?

Have you seen state of Venezuela? US threatened to go in and supported an opposition. And the result is failure and real tragedy for the people. Now they are blaiming Cuba.

You don’t need a majority to create a revolution that succeds. You need an enemy which is lacking morale and the means. The Iranian regime supporters now have morale (US dropping out of deal, and allies which can’t stop US influence) and they obviously have weapons to crush the resistance which have none.