Really? It seems like some of the biggest titles for PlayStation are single player games. Multi-player is often tacked on, but I doubt it's the main selling point for most of their titles. Would so many people have played the last of us or red dead redemption if they shipped those games without any single player campaign and had only the strength of their multiplayer experience to go on? Final fantasy, kingdom hearts, Spider-man, God of war, Detroit: Become Human (Quantic Dream titles in general), Persona, Cyberpunk 2077, these all depended heavily (or entirely) on single player content.
Plenty of folks would have welcomed a change to play those kinds of games if they were just a download away. Even multiplayer games aren't necessarily off the table if unofficial servers are created and can be used, and piracy aside, it's compelling to be able to run your own software on the devices you own.