My thoughts:
Someone earlier mentioned that revolvers have been in use for over 100 years as effective weapons. What came before that? Muzzle loaders. They have been in use for significantly longer. Doesn't mean they are better, or even equal to revolvers. Does this mean Autos are better? No. But technology has progressed. Back around 100 years ago, the revolver was the state of the art in personal defense technology. As a solution to the shortcomings of revolvers (lack of capacity, slower reloads) autopistols were invented. Autos are simply the next step in firearms technology. Doesn't mean revolvers are obsolete. Hardly. But today is the age of the auto, no question.
I just thought of another thing. Revolvers ain't my cup o' tea. I don't own a single one. I am also fascinated by mechanical things. In a operating sense, autos have more stuff going on. Metal sliding against metal, springs working, moving parts that I can see operate. I like that kinda stuff. Probably why I don't get as much of a kick out of boltguns either. Some say that since autos have more moving parts, there is a better chance that something will go wrong. That may be true, however, that is part of the quest: To design and build something more complicated, yet more capable and make it work everytime. A single malfunction is a failure. Revolvers are very simple. There isn't much more that can be done. The mechanical challenges have basically been overcome. The auto is still a work in progress to some extent.
Look at the 1911: The design is nearly 100 years old. Some still haven't gotten the bugs worked out. Say you buy a 1911. You take it to the range and you have some malfunctions. You take it home, dissassemble it and start tinkering. Analyzing the mechanism for any signs of the problem. File here, adjust there, and try again. After a fashion, you have a detailed understanting of the function of not only each component, but each part of each component, and how they all work together make the whole system of parts work as a whole to achieve the desired result. Not bashing 1911's either. I have a Kimber that has run flawlessly right out of the box.
Now look at the Glock. This is only because this is the hangun I have the most experience with, not to start some flame war. My glocks have thousands of rounds through them, with so few malfunctions that I can remember each one individually and how it happened. Glocks are not designed to look pretty. They are designed with function alone in mind. The only reason other guns made today are not blocky and rectangular is to prevent them from looking like Glocks.
My train of thought has kindof derailed at this point, but the jist of my argument is that autos are modern and have great appeal to people who are fascinated by mechanical devices and are intrigued by new stuff with an eye toward what the future holds. Revolvers are common, accepted, and, well, not so new. Doesn't mean they are bad. Hell, for the most part, they can't be beat in terms of accuracy or muzzle energy. But for people like myself, admirers of discovery and innovation, autos are where it's at.