Any kind of governance requires some consent from people, even if it is not in majority. A lone dictator with no support from the people fails pretty quickly based on our experience in the past a hundred years.
Well no, the whole point of totalitarianism is that the people aren't even allowed a choice in the first place. A lot of people did speak out in Tiananmen Square and it didn't work out so well for them.
Russian later did succeed at overthrown their government with military support.