The board would die. There aren't enough people in the world, let alone on this board, that are interested in Japanese culture outside of anime and manga. I would love to be proven wrong though. I adore Japanese film, literature, and cuisine so I would be very welcoming of such a change.
>What does /jp/ - Japan/Anime, think?
I think being so openly cynical and critical of the quality on the content and userbase of the very board you're posting on is rude. If you want to discuss Japanese culture, that's swell and well, but you don't also have to speak ill of the guys who use this board in the very OP.
>having any actual discussion outside of the anime review thread or the cute anime character threads, is basically pointless.
Pointless? No. Learn patience. Many of us have been getting by fine with discussions taking place over the course of years. An antiquated thread isn't just a conversation, it is memory. A time capsule of what anime was years ago, what has changed since, and how we who have taken place in the discussion have changed. To be able to share your opinion on a subject many hold sentimental feelings for, and then to also reflect on the feelings you had about the same things years prior is an incredible luxury you can't find anywhere else besides oldschool forums. We're slow because that's how we like it.
Who are you quoting frend?
I don't see the point, the board being slow is kind of a positive thing since it means that you can make threads about whatever Japanese topic you want and they won't get bumped off by people spamming vtubers and idols within a day like on 4chad /jp/. We've had threads on Japanese internet, learning the language, cars, music etc. and some are still up despite being several years old. If you want to discuss something Japanese besides anime just make a new thread for it.