IMHO you are missing a big big point.
Multiplayer and co-op are 2 completely different things, while I agree with you concerning the multiplayer, the co-op limited to 2 max 4 players could be an option. Co-op does not require any external server or anything special to work. For example in BG it is possible to do co-op it is far from being stable or bugless still people can enjoy play BG with friends.
So for me +1 for co-op!
This is great to hear, I just realized that I wasted some of my money on Torment: Tides of Numenera, which is a shame. Turn based combat is so boring, I can't believe that they'll ruin the game doing this.. If only I could get back my pledge there I could use those money to raise my pledge for Pillars of Eternity..