Batman Beyond
The Tommorow Knight
As for the other comics being over, that doesn't mean there's nothing to talk about. Harry Potter's over and has been for several years, but the fandom's still pretty active. To say nothing of Star Trek (before the reimagine movie this past year), Star Wars (sure there's Clone Wars but most of the talk is still about the movies), Final Fantasy 7 (or any game that isn't the latest one), anything Shakespeare or any other dead writer did...
Yeah, to say that there's nothing to talk about just because a series is over doesn't work.
I don't neccessarily disagree with you that a dead series won't be guaranteed to be less popular than an ongoing one, but the real whole in the argument here is that you're comparing Pokemon to Shakespeare.
I like Special more than Shakespeare(and yes I have seen more of his work than just "Romeo and Juliet", in fact I much prefer "The Taming of the Shrew") but Shakespeare and his work were a revolution in the way writing is done today, he was a complete switch around and stepped up what one could do with writing. Most writing today(including Special and other manga Pokemon or otherwise) does owe it's quality at least in some small part to Shakespeare. Special, when you get down to it is lesser known, often glanced over manga series, Shakespeare completely revolutionized the theatrical world.
Like I said I don't disagree but the two subjects don't really seem to be comparable. And when you consider that Star Wars and Star Trek have a large cult following, and the fact that TV series and movies don't work the same way manga or any "you have to actually read" material works.
Usually J.K. Rowling's Harry Potter series is seen differently because of it's popularity and the book's own qualiy in itself, AND it managed to land a movie series, which lent heavily to it's range. Special and other manga on the other hand fall into the idealology that popularity can be leant to by if it's still going because unlike the other examples you listed they aren't famous enough to leave a permanent impact. They aren't particularily broadcast in the same manner. And unless someone decides "ah what the hell" in a position of power over at Nintendo and other places, none of these series will ever get an anime series, which would be easier to market and lend to the popularity of any manga. A good number of them have potential, but there run and likeness is more dependant on how much has been put out and if it's still BEING put out.
Otherwise, I agree with you completely. ^_^