I honestly don't know how the popularity of manga and western comics have been going for a while now, but here is how I see the thing personally:
Like someone mentioned earlier, manga came in as an underground hobby (that's how I got in) and it was vastly different to what one was used to. At that point I would read any manga and watch any anime that I could get my hands on and all I saw was awesome. Also manga had a much more mature (with which I mean gore + sex, not actual maturity
) approach to things than your average superhero comic.
However in time as manga's popularity grew you started to notice that just like with western stuff, a very large percentage of the manga/anime output was crap. Of course everyone had their own idea on what was that crap part, but I'd say that the crap percentage was pretty much constant. Ergo the novelty of the thing wore off as more and more people were in to it.
Trying to bring this to the actual subject of the OP, I'd say that the fluctuating popularity of manga/western has little to do with problems within western comics since they both have their own problems. Manga just had it's peak since it was suddenly more "in". Thus I think both could learn some minor things from one another, but mainly should keep to their own style. I like the fact that they are different, it's always fun to read something and realize that the other would never come up with something like this
Gives more variety in all.
Now if we concentrate specifically to SUPERHERO comics, then I'd say (based on things I've read/heard, not things I know personally) they could learn a thing or two from manga AND other types of western comics. However I'm not really expert on this as I don't much care about superhero comics anymore.
Like someone mentioned earlier, manga came in as an underground hobby (that's how I got in) and it was vastly different to what one was used to. At that point I would read any manga and watch any anime that I could get my hands on and all I saw was awesome. Also manga had a much more mature (with which I mean gore + sex, not actual maturity
However in time as manga's popularity grew you started to notice that just like with western stuff, a very large percentage of the manga/anime output was crap. Of course everyone had their own idea on what was that crap part, but I'd say that the crap percentage was pretty much constant. Ergo the novelty of the thing wore off as more and more people were in to it.
Trying to bring this to the actual subject of the OP, I'd say that the fluctuating popularity of manga/western has little to do with problems within western comics since they both have their own problems. Manga just had it's peak since it was suddenly more "in". Thus I think both could learn some minor things from one another, but mainly should keep to their own style. I like the fact that they are different, it's always fun to read something and realize that the other would never come up with something like this
Now if we concentrate specifically to SUPERHERO comics, then I'd say (based on things I've read/heard, not things I know personally) they could learn a thing or two from manga AND other types of western comics. However I'm not really expert on this as I don't much care about superhero comics anymore.