Sounds great to me, mostly for the following reason:
There's a lot of natural drama to be mined out of middle to late high school and that kind of soap opera-ish element to Peter's social/private life is a great part of what makes him who he is, for my money. Could easily get 3 films out of him in school.
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I kinda get the reason why they want him back in high school for the reboot, but honestly, I could do with Peter ageing out of high school after a couple of films (which he logically should given the MCU timeline).
It seems that 90% of Spider-Man media focuses on constantly reinventing that 'classic' period of Spider-Man history - namely the Stan Lee/Steve Dikto years (which includes Peter's high school and early college years). The Raimi films. Spectacular Spider-Man. Ultimate Spider-Man (both the comics, and the animated series). The Webb films. Now the MCU version.
So now the popular perception of the Spider-Man mythos is Peter as either a teenager or young adult struggling to balance his high-school/college life with his web-slinging (at which he's still a relative novice) while being hated by the public and media, slandered by J Jonah Jameson, and fighting the same old villains that include the likes of Doc Ock, Green Goblin, Vulture, Sandman, Electro etc.
Honestly, Venom and the whole Alien Symbiote arc is one of the few post-60's aspects of the Spider-Man mythos that has really stuck in the pop cultural consciousness.
I for one would like to see an attempt at an adult Spider-Man. Let Holland grow into the role. Let him gradually evolve into a veteran superhero. But don't keep him in amber as a teenage high-schooler for God's sake!