This is great news. I don't mind if companies create multiplayer mode as something completely separate, but it's annoying if it's being inserted into a traditional singleplayer RPG campaign.
And why having a multiplayer mode should be a bad things? I've seen a lot of single player games that they add a multiplayer mode like TLoU or Ghost of Tsushima. If the main game is good I can't see why even the multiplayer mode shouldn't be good imho.