(It is interesting, as if you go back, mtgx has been banned since 2019 because of a "personal attack" on Carmack 100% is NOT personal and that, supposedly, their views are "predictable", which, if applied fairly, would get most of us banned as we are all broken records ;P.)
Regardless, that copyright was 7-10 years originally is close but not quite right in a way that matters: it was 14 years with the ability to request a 14 year extension. (This being the same in the US law which came much later, but was originally from the Statute of Anne in the UK.)
So like, 10 is close enough to 14 and yet, not only do those 4 years feel (to me) like they matter a lot, it is arguably 28, and 7 is definitely underselling the protection they were being granted. That said, it also only applied (in the US) to books, maps, and charts, so in some sense wasn't even the same, broad concept.
The discussion of how long over time is interesting as, in a very real sense, our ability to monetize copyright quickly has increased: the Internet lets you immediately address a nationwide market, while it easily could have taken decades with nothing but (expensive to use) printing presses making materials to distribute around using (slow) horses and (for even wider distribution) boats.
These days, I almost get the impression that a lot of media companies try to make the vast majority of money off of something in the first few MONTHS and then nigh-unto discard it entirely--not even bothering to finish things for later syndication--while they move on to new content and new IP.
They are then occasionally mining their old catalogs of IP to do like, a "reboot", but I frankly feel like no one would stop making content if they lost the ability to later do that, and I also doubt that the original creators are being compensated much for that later possibility (as it is so hit and miss).