> Instagram couldn't switch their algorithm because people think they still want to see the content they've been seeing...

This will differ a lot based on the user. I only use Instagram to keep tabs on activities in a few venues I frequent. I follow those and I only see what they post. Perfect. For it to show me random crap that's trending would totally break it for me. I haven't noticed this yet but I'm not even using their app, only the website.

Similarly, Facebook killed itself for me when it moved from the timeline to the algorithm driven feed. The feed showed me more random crap and less of the people I was interested in. Eventually I left and replaced it with nothing.