Although there's been a slow change (with the various vegetarian trends as impetus), the problem is many people associate dried beans with poverty and privation. Plus, of course, they prefer the convenience of opening a can.
In the American South, of course, soup beans and cornbread are a time-honored tradition. So we probably eat more beans, per capita, than most other folks. Beans are also very popular in the Southwest; and the "cowboy cuisine" fad is another engine driving their popularity. And if anyone thinks New Englanders are going to give up their baked beans (always made, properly, from dried beans) they better give it another think. Ain't gonna happen.
Every western European country has at least one signature dish based on dried beans, and foodies here are having a ball exploring that world (not to mention arguing points of authenticity).
I would have to conclude that, celebrity chefs aside, calling dried beans underused, at least in America, overstates the case.