How do you see non-academic mathematics?
I have an impression that the academy has still a quite significant prestige and is thought to be the safe-guard for "real science". That is, to verify that those that have the most experience in science, can produce science and have the "blessing" of the academy, in order to deviate from informal publications made outside of academia, whose content cannot be guaranteed and that do not necessarily go through peer-review.
However, esp. in mathematics, there's no real reason why mathematics cannot be produced anywhere. I.e. academy does not add much to the process of doing mathematics. Social connections to like-minded people perhaps.
Then there's the internet, which makes all information pretty accessible.
So do you think there's a place for "open source, non-academic mathematics"?
I think it is likely that mathematics, outside of areas where work is secret (cryptography, finance) or very deep/structured areas that need years of training and immersion to be successful (arithmetic algebraic geometry), will increasingly be done outside of academia to a point where the production from non-academia is comparable to what is done in universities. Part of that may be from a shrinking of academia.