I might phrase it, "whatever is embraced by the masses becomes more appealing to the masses." Broadening in appeal is not necessarily worse, although it's surely worse from the perspective of the initial specialized interest group.

Yes, the Internet of yesteryear was more interesting to our type of people, but it had no appeal whatsoever to anyone else. The world is better off today with an Internet that billions find fun and useful, even if it's way less fun for us specifically.