The upper classes don't need to be deposed via revolt. Diminishing their wealth and influence to the point where they can no longer do whatever it was that pis

The upper classes don't need to be deposed via revolt. Diminishing their wealth and influence to the point where they can no longer do whatever it was that pissed you off in the first place is good enough. For example, if nobody was buying Saudi oil they wouldn't have the money to spend fighting a war in Yemen.