Some manga publication has opted for the sleaveless cover and inside-cover ad space to reduce costs. Recently, the famed artists of the Fist of the North Star and City Hunter manga are founding a new manga producation and publishing house to counter the onslaught of video games. Economically, it compete with manga for the meager pocket money. Socially, its competitive and interactive nature steals the light of manga and anime. If children were trading knowledge on Doraemon's gadgets in the 80s, they are now discussing the secret boss monster in Final Fantasy 9 or the combo attack in Tekken Tag.
Time is also a limiting factor.
Finally, the glorious sign of salarymen and students alike reading manga on the train is now replaced by gameboy and, more and more, mobile phones. Manga and anime begin to land in America at about the same time as Super Nintendo. The cultish hobby 10-12 years ago did not wane witht he competition of video games or digital culture. Quite the opposite they grow together. More directly, many fans of anime begin their foray because of videogames.