We tend to get a lot of these threads about devs commenting on singleplayer, so I figured people would this one.
GamesIndustry.biz said:"I think things won't change, because there is a difference between people who play single-player games and people who play multiplayer games, as much as there are differences between people who are introverts and extroverts," he said. "There isn't anything we need to do [to ensure single-player games can sustain themselves]. There will always be people who enjoy playing single-player games more than multiplayer games."
"It's very difficult that multiplayer games are so profitable, but single-player games are where a lot of indie games come in. With single-player, you can create the game you want to create. We leave multiplayer games up to the larger publishers looking into the market, but it's very adventurous to create a single-player game with larger publishers. We started out as a Kickstarter project, and before we started the project, a lot of larger publishers said there wasn't much of a market for sidescroller games [like Bloodstained]. But we proved them wrong by having a successful campaign.
Source: https://www.gamesindustry.biz/articles/2018-09-10-single-player-not-going-anywhere-igarashi"With the rise of multiplayer games, I don't think single-player is in danger. A game doesn't have to be profitable, it just has to break even."