Observation - it seems to me that when regimes fall, there is usually a small core of people protesting, acting, and leading. It starts small, and grows as that core build a center of mass.
There were 30-40K of that center of mass murdered by this regime last month....I think those were probably the most likely people to foment the desired regime change, and they are most certainly not going to be involved.
That leaves the question - who is stepping up next?
Wave 2 of the 'core' will be less certain, less dedicated, less willing to take action.
Finding a new core willing to take to the streets after 30-40K people were murdered is going to be the real challenge to regime change.
Are they waiting in the wings for the bombing to stop? Are they waiting for the bombing to shift from strategic targets (SCUD hunting?) to taking out the local IRGC barracks before they move back to the streets?
I think there needs to be some thought given in targeting to that - what do the people on the ground who they want to have rise up need in order to start rising?
If those 30-40K people were still around, there's your core/beginning of a revolution and regime change.
Without them....who will light the fuse?