What would the red line be for you?
The regime has already exceeded my tolerance level, but I think what you're asking is, what would be my 'go' signal.
I don't think I could tell you specifically what it would be, but I can say that it would likely be some sort of incident of egregious transgression against the people by the government. I mean a deliberate, violent act of heavy handed force. Something along those lines.
I personally think it'll take some type of incident of that nature to spark an uprising.