Single player games aren't dying. Never alluded to it. But its obvious multiplayer is where the money's at so publishers making more multiplayer centric games doesn't warrant the criticism it gets them because that's where consumers spend money, and a lot of these consumers who complain of multiplayer games have confessed that they did sometimes buy MT's in these games, and these people are in no place to criticise companies for having it when they supported it.
Its also consumer's vehement opposition towards MT's in single player games which turns publishers away from them. If single player games weren't demonised for monetisation the same way multiplayer games are there would be a lot more of them.
We've seen plenty single player games bomb last year, which had good reviews. Dishonored 2, which played fine on consoles but not PC, Prey, which played fine on PC but not consoles, The Evil Within 2 and Wolfenstein 2. Doom on Switch. The problem is people don't put money where their mouth is, pretty much the only single player AAA games that sell are open world games, Nintendo and Naughty Dog and RPGs and its becoming homogenised due to this fact.
I also said they were not dying, but that hasn't stopped other people or media outlets from harping it.
Multiplayer is where it's at due to multiple factors. Being able to play with your friends, drop in and drop out are one of them, a highly valued one at that.
I don't have to spend money on an MP based game, let alone play it in order to voice criticism of it's pitfalls and it's negatives. Saying people that have bought something once have no right to an opinion is a steep hill to take, once I wouldn't go for, because it's clearly designed to disable the other to make one's say hold power over what they could say.
And we have also seen multiplayer games bomb over the years like Battleborn, Lawbreakers (being locked to just PS4/PC didn't help) and eventually Radical Heights (which ended up sealing Bosskey's fate). We've seen mp games bomb due to trend chasing, poor gameplay, P2W schemes and locking them to a platform or two. Meanwhile games like Paladins managed to survive, as well as Overwatch, even Heroes of the storm, a game far less popular than LoL & Dota 2 and that still manages to thrive, without preying on you like other games have before in a big way.
We still have good SP games though, and they aren't all open world games either, let alone "led" by only two console companies.