While there is definitely a focus on multiplayer games ($$$ drives all things), these last few years have also yielded some of the most incredible single-player games. Major studios are investing in AAA primarily single-player titles (from this year alone, God of War, Spiderman, RDR2, Assassin's Creed Odyssey) and there is also an explosion of high quality indie titles.

As someone that almost never plays online except some occasional co-op with friends, I don't feel one bit neglected by the current state of the industry.