You can do this without giving up 90% of the urgency the story or agency the characters had. Look at Hajime no Ippo as an example. The entire story is about the main character slowly growing and getting stronger, all while travelling down a road with a set goal. It never loses sight of said goal even when it diverges into training or other plot lines. Every step the story takes is about achieving that final goal for either the main character or the side characters.
I wonder if modern shonen writers just can't write by contemporary standards, or if they just don't care about them, or if they are purposely going out of the way to avoid some of those expectations, because that is their own brand of originality to age old plot-writing?
Full Metal Panic is actually a great comparison for Blue Exorcist. They both deal with dual plots. BE has the school plot and the supernatural revenge plot and FMP has the school plot along with a military/spy thriller.
FMP manages to interlace both of it's plots expertly, every action taken in either plot progresses the story in both. Sometimes in ways you wouldn't expect. BE on the other hand hasn't managed to do this. It lost all of it's agency and urgency the second they hit the school, while in FMP the agency and urgency remained. Even in moments when you'd think it wouldn't. They hit similar character points as well: the identity confusion, the idea of belonging, and so on. The difference is that FMP does them over entire seasons, not single episodes. Thereby earning the progression.
FMP:TSR was entirely about the idea of "where do I belong," a point that BE seemed to finish with after an episode. Everything in the entire season, in both plots, was built around answering that question for it's two main characters. It hit similar points as the single BE episode, but because they earned the cliches it hit much much harder and left a better memory.
My problem with BE isn't it's generic-ness, which it sort of is, but the fact it hasn't gone out of it's way to earn any of it's character progression. It dispatches what should be an over-arching plot line for the series in a single episode.
Most of these issues seem similar to SAO, and and they both seem to have large popularity regardless. In a world where people can't watch a full commericial without checking twitter or facebook, perhaps 15 minute resolutions, rather than "earned progression", and shifting plotpoints of strength into the background in order to build up characters, rather than interwoven, tight stories, are the expectations of the youth...
I would sacrifice Adventure Time, Regular Show, Uncle Grandpa, Gumball, Steven Universe, and every other current CN show for a renewal of SBT, Megas, and Samurai Jack.
No regrets.
Uncle Grandpa can DIAF... I actually like the rest in various degrees though. And I'd feel bad for the artist and creators getting their shows cancelled!
Most of CN's old Shows would actually just be better as AS / Toonami Originals now, or OVA / Movie type deals. Much like with the anime of today, I don't think people want the same thing from the cartoons of today... but those who still remember the classics want works that carry on the traditions and heights we've come to expect.
high school is in so many stories because while us westerners consider college and our early 20s to be the best time in our lives, the japanese considers highschool to be the best time in their lives, thats where most of your adventures and things take place before your thrust into the workforce as is japanese culture.