How are you sure about this? What evidence or statistics do you have that there have been enough people who want an alternative that is sufficiently different? It appears the regime is great at persuading people they want some sort of "light reform" and propagandized the populace to hate taking a risk for real change. It appears lots of people talk the talk but are comfortable where they are and in fact resist change when it happens. Otherwise you should have seen some level of unrest given the lack of water and electricity and the regime at its weakest.

Vice versa, how sure are you about it being true in other countries? Looking at various elections in parliamentary systems like Germany, France, or Canada, it does appear that even a strong opposition has a really hard time competing with the status quo in a "democratic" setup. The system resorts to all trickery including importing voters and creating unnatural coalitions to enforce the establishment agenda. And that is not including physical elimination of the opponent which was attempted in the United States.