We had two paths in front of us- Naughty Dog provides an update on The Last of Us Online, emphasizes their commitment to single player narrative driven games - The SportsRush

Naughty Dog announced they were cancelling The Last of Us Online. They even emphasized on their commitment to single-player titles.

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The Last of Us Online Canceled by Naughty Dog to Focus on Single

The Last of Us multiplayer development reportedly slowed as

Naughty Dog's narrative lead explains the story of The Last of Us

Naughty Dog's narrative lead explains the story of The Last of Us

The Last of Us multiplayer game aims to be free-to-play - Meristation