André Staltz - The Web began dying in 2014, here’s how
This is the clickbaitiest of titles, but the post has some good sobering analysis of how much traffic driven by a small handful players. It probably won’t make you feel very cheery about the future.
(For some reason, this article uses all-caps abbreviations for company names, as though a stock ticker started generating hot takes: GOOG, FB, AMZN, etc. It’s a very odd writing style for a human.)