I remember when myspace and Netscape were pillars on the internetThe pillars aren't going anywhere... Prime, Netflix and yeah, D+. Expansion and contraction will continue below their level (like Hulu folding into D+).
I enjoy the Amazon approach of adding channels, that's how I typically add Paramount+ when we do sub to it. Nice going to a single place and toggling on and off the content we want to subscribe to rather than manage all the disparate services.