For me a big difference between North Korea and Iran is the balance of soft vs hard power in those countries. In Iran the ordinary people tend to push back in a lot of ways and the government gives ground if grudgingly and slowly. And there is a lot of politics going on between factions with real power.

Given that I'm willing to be very patient. Seriously, the generals of the Red Army ran the soviet union for 35 years after Stalin died and then they passed on. So too will the Iranian revolutionaries.