[TeMPOraL]

Can't say much about slavery, but the issues of child labor and women rights weren't solved through a bloody revolution, and there are good arguments that they were primarily the consequence of technological progress fueled by economic growth.

[actionfromafar]

On that note, we don't know for how many decades a popular uprising will be even possible. Technology may offer a turning point at sometime, where a rogue government can obtain total control and force over its populace.