There’s a phrase, made popular in recent years by this Nature article, that scientific knowledge (the amount of total citations referenced is their exact metric) doubles every nine years or so. This follows an exponential trend where n references are created in any year, which increases in the following year, using the n number of references in the previous year(s) to create more references. This may be a very analytical way to view “knowledge,” but I think there are some applications for baseball here.
If we think of that n as observable events in baseball, we can say that knowledge in that same sense has been increasing according to a Moore’s-esque Law.