Well yeah, the general fandom put all its hopes and dreams on this thing, and when it underdelivered and the single-player DLC was confirmed to not be coming, there's not much for most people to go talk about. You see this with other franchises that have come to less than stellar ends or have been done for years - you rarely talk about them unless there's a reason to talk about them.
I think putting the series on ice was really what killed everything.
If you look at what we were discussing before MEA came out, it was the previous games with an eye towards what we wanted in the next title. Now we know there won't be a next title, so it kind of kills my enthusiasm to talk Mass Effect.
At least I still have Dragon Age, although (bringing this back on topic) I do hope that Bioware starts correcting for what is becoming, in my opinion, their gravest sin: Minimizing the main story of a title.
Going all the way back to Mass Effect 2 and Dragon Age 2, there's been a long pattern of Bioware letting the main story of a game flounder while they focus on side stuff. I'd argue that Bioware hasn't really had a really strong backbone of a main story since Dragon Age: Origins. Ever since then the main story has just been an excuse to get you from point A to point B where they can tell an individual story about that area (and then they fell down and failed at that in MEA). Think about it: Can you, off the top of your head, give an accounting of MEA's main plot general beat for beat? Compare that to ME1, ME2 or even ME3.
Sure, you occasionally get a highpoint here or there, but taken as a whole, Bioware's main stories have had really weak flow lately.
That being said, Trespasser was really good so I have hope.
Honestly, if there was a Dragon Age community thread I'd post like hell in there, but I doubt starting one here in Community would get any traction and I sure as hell am not starting a DA thread in General Gaming. I don't bother reading DA threads in General at this point because they inevitably devolve into driveby shitposting.