I think the declining popularity of comics has less to do with the content (because let's face it, a young action fan will read anything that looks cool, whether it's Goku, Spider-Man or someone else) and more to do with the marketing. Which is to say, they aren't marketed properly at all.
Look at magazines and newspapers; you can get them just about anywhere. Arguably, its their greatest strength. Comics, on the other hand, are generally only available at comic book shops. Kids can't drive, and most parents aren't going to make a special trip out to a comic shop when gas is as expensive as it is. Grocery stores, laundromats, convenience stores, gas stations; these are the places where comics should be sold.
Look at magazines and newspapers; you can get them just about anywhere. Arguably, its their greatest strength. Comics, on the other hand, are generally only available at comic book shops. Kids can't drive, and most parents aren't going to make a special trip out to a comic shop when gas is as expensive as it is. Grocery stores, laundromats, convenience stores, gas stations; these are the places where comics should be sold.