Democracy, or that standards of living are so high its not worth it to deviate from the status quo? With no political science knowledge, I'm willing to have my view challenged and changed. I think there are 2 elements that are more important than democracy in and of itself.
1. High standards of living that alter the risk-reward ratio for making a political change
2. The rise of Corporations - these days, people view the government as a bureaucratic, slow, and useless entity with decent, but low pay. People aspire to work and move up the ranks in private corporations. The role of the government has been greatly reduced in the ordinary lives of citizens. That means the necessity of making a grand political change is just not as important as it was historically.