multiplayer games > singleplayer games. End of story.
I'm sure many people would disagree.
Breath of the Wild, Super Mario Odyssey, Horizon: Zero Dawn, God of War, all singleplayer titles released within the last 16 months, and all of them critically acclaimed and heading towards 10m+ units sold.
Multiplayer focussed/only Games can be absolutely massive (pubg, fortnite, overwatch, league of legends). But for every one that attempts it tens of games never reach success.
The past year has shown, that incredible Single Player experiences are still HIGHLY sought after and can achieve dizzying success.
"Singleplayer games > Multiplayer games. End of Story" - just like your statement, this is of zero value.