What about Voltron?! Sure, it was altered for American audiences much like a veterinarian alters a non-breeding dog, but it was Anime what was part of American culture LONG before Pokemon was around. This guy should have at least tried a little research first.
Besides, though one can easily find faults in Pokemon, its "moral fiber" really isn't much of an issue. Every episode was (is?) overflowing with themes of good sportsmanship. If it was a choice between having children watch Pokemon or watch Barney/Teletubbies/whatever, I'd probably choose pokemon (hopefully I just won’t have to make such a choice).
But to play devil's advocate (as to why Western cartoons/comics have merit, not as to why Japanese cartoons are supposedly trash), American Cartoons have quite a bit of merit on their own and certainly should not be ignored. Pirates of Dark Water, Batman the Animated Series, Futerama, Gargoyles, X-Men, Red Planet (a miniseries), The Tick, King of the Hill, Justice League (and Justice League Unlimited) and if I can include Canada, reBoot are all wonderful examples of western cartoons. Each had splendid animation (for their respective time periods) and compelling plots. The list only gets longer the more generous we are with what we classify as compelling plots (Dextor's Lab, Animaniacs, Tinytoons, and Pinky and the Brain could all be added) There are plenty of poor cartoons, to be sure; Chuck Norris: Karate Kammandos comes to mind, but to classify American animation as in decline is rather curious given its artistic successes.
As for comics, there seem to be two reasons for the American decline. 1) Publishers drove fans away with poor writing and marketing, leaving only the diehard fans. 2) American comic talent also has other outlets nowadays.
Consider modern comics like Ultimate Iron Man (and the Ultimate universe in general) or Truth, Justin, and the American Way. These are top-quality comics with fantastic art and intriguing stories; it is no fault of the product that their fan base is less than the fan base of manga.
As for the new outlets, we shouldn't forget web-comics! PvP, Penny-Arcade, 8-Bit Theatre, Kidd Radd, Mac Hall/Three Panel Soul, It's Walky/Shortpacked (well, there are really 4 series there), and countless more have defined a new industry that shows potential for outdoing printed comics. Penny Arcade is so famous that the video game industry courts them like investors. The creator of 8-Bit has been able to use the fan base he created with his comic to launch his own novel and printed comic series. When the guy over at Goblin Comics asks for a few hundred dollars in donations, he gets a few thousand just because people love his work.
No, American cartoons and comics (and culture in general) are doing rather well. We are proficient and more than capable of telling mature stories.