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Yet another negative post, but hey... there's no use dicussing something you're already content with, right?
Why would you spend so much time and effort on something that is completely disjoint with the online experience?
There's a niche for games like that, they're called RPG's. The technology for immersive single player storylines has been around for over 50 years, the entire reason games didn't "exploit" it was due to the fact that people generally want to play with others when they log onto an online game.
If you want to see an example of a game that had a great personal story, but nothing else (in my opinion and in that of many others, or else it wouldn't have gone f2p) is SWToR:
Every games personal story is leagues behind the latters, yet those games are doing markedly better.
Please, CEOs/game directors, get rid of this ridiculous abomination that only serves to fragment the in-game community and add to costs needlessly.