Do you think that people need to be unhappy to want change? Like would happy people do a Revolution or is it only people who feel miserable with the status quo?

To have some revolutionary potential, you need to see the injustice in the world. You don't have to directly experience this injustice to see it, which is why John Brown is such a cool motherfucker.

At the other end of the "change" spectrum, the royal family in the UK do some charity work to "change" things. Maybe they do believe that people shouldn't starve, but system change is against their material interests.