To me, the question is not 'Is there...?" it's "Should there be...?" Sometimes, quick solutions are the best ones. A 'revolution', depending on how it is handled, can do just that.
I'm a bit long-winded, bear with me.
One of the most well-known revolutions was the American Revolution in the late 18th century. It took 100 months from April, 1775 to Sept., 1783. During this time, approx. 50,000 people fighting for the colonies were killed due to the war efforts. About 500 per month.
Now, let's consider that 'war' is synonymous with 'revolution'. Coups, however bloodless they are, will likely trigger more rioting then there was before (if there was none before, then it's even worse), and still you might get prosecuted by the International Criminal Courts (ICC).
So, let's make a comparison between the American Revolution and a particularly nasty war, the Vietnam War.
The Vietnam War lasted 116 months, and suffered the U.S around 215,000 casualties, counting those MIA. 1853 casualties per month.
There are several factors that could give reason as to why the death toll is so much higher; distance between involved countries, technological advancements between the two wars, and the duration of war.
Let's start whittling these down.
Both wars were carried out overseas, so the distance aspect may as well be taken out.
The duration vs. death toll ratio can be fixed using proportions (algebra, woooo). Making the durations equal, proportionally, the death toll of a 100-month long Vietnam War would've been... 100m = 86.2% of 116m --> 215,000d x .862 = 185,330d
That leaves only one factor that might explain the drastic increase in casualties: technology. Now, I know that the U.S was on two different 'sides' to those wars, being on the home front in the American Revolution, and a foreign assault force in 'Nam, but I'm pretty sure that didn't make much of a difference. If I somehow offend anyone with that assumption, I apologize,
So, today, a major war fueled by revolution would be devastating. It would take 100 months, if not done 'correctly' the toll would be enormous with the tech now at hand.
Revolution should come when the current conditions are either very critical (high impoverished population, high percentage of unemployment, stock/economic markets fail or crash every other breath) or are oppressive (be it racially, physically, sexually, alphabetically, etc.) in some way. Revolution should be a last resort, an effort to improve things, using them simply to vie for power is shameful. They're supposed to give enough power to someone to organize, to establish, to set a course, and then they blend in with the plan that was set forth.
If revolution is stirring, whomever takes it upon themselves to lead it had better have a good head on their shoulders.