I started thinking about this today after watching Ep 147 of Hunter x Hunter and realizing that HxH will be ending in 1 more episode. It got me thinking what will the future of anime and manga be? HxH is ending for probably a couple years or more, Naruto is on the last arc and will probably end within a year or so, Bleach is on it's last arc as well (I think. I don't really watch Bleach), the only other long running anime that I can think of that will be around within a year or two will be One Piece (which will be around for a long time still) and Fairy Tail which just started back up several months ago.
I began to think about some popular new anime that could take the spot and it seems like Attack on Titan, Tokyo Ghoul, and Akame Ga Kill are the most likely candidates. The issue is that Tokyo Ghoul is ending this Thursday, and Attack on Titan and Akame Ga Kill probably won't go over 100 episodes if I had to guess.
Do you think this marks the end of long running Shounen series? We will be seeing shorter 12-25 episode Anime taking over? Or will we see a new series emerge? I'm kinda excited to be honest. I'm pretty young so I never go to see the start of shows like One Piece or Bleach, although I did catch Naruto when it first came on Toonami. Hopefully, we'll see a new Shounen series that will shake things up.