1. Discrediting MP in the FPS genre is ludicrous. The things you've praised before, DOOM, Quake and Half-Life, had extended life because of multiplayer. Single-player in those games were, for their time, innovative in their own right but its extremely wrong to devalue the MP aspect simply because it doesn't interest you. If you really want to look at it, those same games gave rise to the whole competitive FPS market. Counterstrike and TF started off as mods, now grown to their own games. Whatever you think of MP, it did a lot for FPS's and kept the market alive when it could easily have dropped off. Consoles brought the idea of the FPS to the mainstream because, like it or not PC only recently has seen a surge in the mainstream market. Notice the series that made it big were the ones with the biggest multiplayer base. Duke Nukem, ROTT, Hexen, and many others did not survive.
2. Knocking on derivative games is also ludicrous. So many games have borrowed bits and pieces from earlier titles. I could make a list of things that have jumped from dev to dev but I'm not going to as its not worth it, but its common knowledge that many devs "borrow" from previous games. Its how the industry grows.
3. Subjectivity is in effect, which means you're welcome to have opinions on whatever you want, but if you truly want discussion you have to be open to the idea that your opinions are not universal and cannot be applied as fact.
4. Military shooters are successful because more people enjoy them than don't. At some point the industry will turn as tastes change and people want something else.
5. DOOM 2016 is fun, I agree. I love it. Its not comparable to its predecessors simply because its evolved. It happens to be good because iD figured out how to tap into the feeling of the older games and subvert some of the newer tropes but they didn't remake DOOM with modern graphics. Can't be done.
6. Like CoD or not, its popular still and from what I can tell you're not part of that crowd. That is fine. Don't expect things to go your way though, minority groups tend to lose out on the AAA market. That's how it works. DOOM likely is selling well because there's enough recognition of the name, but boy were a lot of us scared that it was going to be shit. We lucked out but it was close. SO close. Complain all you want, but honestly your subjective tastes are not the majority at the moment (and likely won't be considering other posts I've read by you, no offense but you're in a very minority group with your views on GTA and Mafia in terms of quality).
So its fine that you've got your views, it really is but you've got to realize you're essentially very niche. There are some merits, that yes SP campaigns in CoD games have lost luster, but CoD4 is widely regarded to be one of the best campaign stories told in an FPS. DOOM 1 & 2, Quake 1-4 had little-to-no story beyond flavor. Half-Life and HL2 may have had storytelling contained in their games but when taken as a whole, they were extremely linear and still had setpieces. Replacing the cutscenes with faux-interactive parts in retrospect isn't innovative at all but can actually be maddeningly frustrating. It's all perspective but let's not kid ourselves, they didn't add to the story in any significant way.
Basically enjoy what you enjoy but you're not going to change people's minds on how games are perceived in terms of popularity. Multiplayer is, for better or worse, a huge selling point for games. Its just how these things work.