I think this is too dismissive of other forms of revolution. I like Michael Albert's explanation of revolution, which is a fundamental change in at least one of a society's defining institutions.
http://www.zmag.org/zspace/commentaries/2564
From this perspective, the 1953 US overthrow of Iran's parliamentary democracy (to install a monarch) was a successful revolution. And even a revolution with the best of intentions (which obviously wasn't the case with the 1953 revolution) won't necessarily result in an improved society. To the contrary, society might even regress. If a revolution suddenly occurred right now in the US, since we US citizens haven't laid the groundwork of serious popular organizing and institutions, we might expect a form of fascism to probably result.
From this perspective, the 1953 US overthrow of Iran's parliamentary democracy (to install a monarch) was a successful revolution. And even a revolution with the best of intentions (which obviously wasn't the case with the 1953 revolution) won't necessarily result in an improved society. To the contrary, society might even regress. If a revolution suddenly occurred right now in the US, since we US citizens haven't laid the groundwork of serious popular organizing and institutions, we might expect a form of fascism to probably result.