The problem with Eternal September was, that we suddenly had a major influx of people who thought they knew how to use the Internet, suddenly on the Internet.
They didn't, really, know how to use the Internet.. no, sir!
AOL had its guardians and angels, COMPUSERVE had its governors, and so on - so when this all hit the near-total benevolent sovereign dictator anarachists that were holding the Internet together, it was, literally, a Cultural War.
Eternal September was fucked; suddenly there were shit-posts everywhere, and oh so much entitlement from the 'paying consumers' who were suddenly interested in alt.binaries.* Someone decided that Internet services should be deprecated/ignored - and decided not to build true "Internet OS"'es, but rather "Internet Applications" .. and appstores .. and so on.
Now, it is my strongly held belief, as someone who weathered that fateful day and ever since with a sense of absolute wonder at the stupidity of humankind .. if the brainfucked horde that made up Eternal September didn't have the experience of suddenly getting "on the Internet" from some shiny CD from some TLA with its own custom browser, but rather - the OS was set up to better guide behaviour over the stack from the outset - my belief is that we would still have NNTP, and possibly more of these kinds of services.
Instead of the behemoth (and now totally out of control) web monstrosity.
I mean, at some point, if we step back and see what really makes the Internet, its that there are more ports than just :80, and anyone can make one to another. You just have to have the right bits.
The problem is, our borked OS'es aren't making it sufficiently easy for the Internet to work - for the user - without requiring a long list of third parties.
So, I also think: someone has an opportunity to change everything by making an OS stack which, out of the box, contains a user-publishable/accessible Global Filesystem, which makes the Web seem like UUCP over a soggynoodlenet...
Prior to Eternal September the primary conception of the Internet by those on it was that it was a tool. After Eternal September the primary conception was that it was a channel for consumption and entertainment.