But it is also worth to remember that unarmed protestors rarely "just" overrun the barricades and enter the palace (figuratively). Someone with power (police or military) has to decide that they're OK with letting the protests go through, that is the signal of the end.
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Obviously my opinion, but I was in Tunis, Tunisia during those times.
And there was this rumor that Ben Ali and his close family were "tricked" by the palace guard and the military to leave the country "temporarily" because protestors were going to be closing in (which never happened).
But that is exactly my point, supporters in key power positions decided that it was too much trouble to keep Ben Ali around.
We know how USA has reacted in the past; it carries on as if nothing happened.
https://www.nytimes.com/2019/05/29/us/politics/immolation-wh...
https://www.theguardian.com/environment/2019/apr/15/david-bu...
I assume there are more examples, that's just first page picks from a cursory google search.