And there's also a reason why Naruto went slowly downhill. (More like many, but taking the focus off the konoha11 is one of the main complains from fans). I think this pace is perfect. No zero plot development but not only focusing on plot either. Also, this way we get introduced to new characters (plausible future key points) while seeing the development in both abilities and personality from the main group.
It's refreshing to have a manga that doesnt focus on his main character and 2 or 3 more, but once in a while takes a break from that to build every character a bit while showing us THE SCHOOL, which I might remind you, is the theoretical main theme of this manga. Also, having villain surprise random shit happen so often and no school development at all would be too cliche and forced, while this is well leveled right now.
It's not a stereotypical shounen where the cast barely goes to school. It's their life. A lot of Naruto fans hated Kishi for neglecting the Konoha 11, just like Bleach fans hated Kubo for only focusing on the Shinigami (and even then certain ones).
You're probably going to get 3-4 years of classes.
I didn't complain about the pace which is the only thing keeping me from dropping the manga. I could complain about the pacing being to fast making emotional moments feel dull but again this emotional moments are mostly from random classmates.
Naruto went downhill not because of the K11 neglect. It was because of a failed attempt of world building (konoha has multiple unique clans and numerous jounins, all the other villages only have one or 2 jounins)and kishi inexperience with wars( All the way to the 4th ninja war everything was going fine but then the war where no one apart from naruto and sasuke got to shine).
In fact I will predict now that MHA writer will make the same error kishi made years ago. He will focus too much in all of class 1A and towards the end he will neglect all apart from todoroki, deku and kacchan.
As for bleach comparison. It was a bad one because kubo went on on at least 3 or 4 of the 3 main antagonist groups. The shinigami got extra because they were always on the spotlight side by side with ichigo and even then it was only 6 or 7 of the 13 captains not as much as the 20 of the 20 in class 1A. Everytime he went on with the shinigami he would fill us in about some characters but the only ones who got proper character development were the hitsugaya, byakuya, kenpachi, sui feng and komamura.
Maybe I'm hating too much but I see this focus on all of the class has the death of MHA