First of all, did democracy really solve the governmental oppression? You know what I'm going to bring up here. The moment 'democracy' took over, you got the Great Terror, and conditions far, far worse than under King Louis. I think this is indicative of something being rotten fundamentally in French society. In other words, the Great Terror is proof that something was culturally rotten in France, not necessarily politically rotten, which I'll get to in a moment.
Next point, say you have a house. The house is shit. The roof is leaky, you can't go up to the second floor because termite have eaten the supports. It looks like things are going to collapse. The house has to be rebuilt. Question:
- Do you rebuild it close to the design it had before, but make a few minor changes that might improve some of the previous problems?
Or
- Do you allow really drastic changes in design?
This argument is actually Burke's, and it's basically the idea of evolution applied to government. The latter was the French Revolution. It was no surprise that it went right back to monarchy, just like the English Civil War before it, and within a decade at that.
So, even if you disagree that there was something else undecidely rotten in French society, there is something to be said about slow gradual changes in government to take account for changes in society, like what Britain and other countries did in taking on constitutional frameworks.
Now, returning back to the original paragraph, what was rotten? Well, one key component of l'Ancien Regime is the clergy, and in order to have a properly functioning religious estate, you need to have religious homogeneity in the society. I don't think it's any surprise that at the same moment the enlightenment began attacking the fundamental religious institutions in Europe, that you saw the rise of constitutional monarchies.