@Notos
Well they have specifically stated now that endings will remain unchanged so indoctrination thoery is out the window anyway. That and what you said above pretty much buries it. There will be no further gameplay, just epilogues and movies. There's no way they could do the indoctrination route without anymore gameplay because the Reapers would win. The fleet would be blown up by the time Shep wakes up along with the crucible and the choice you made at the end of ME3 would be meaningless no matter what you picked.
Sadly I do believe now that we are indeed stuck with red,green,blue and all were getting is videos and text to explain the aftermath of our final choice on the choices we have made throughout the series.
For example in green or blue ending the Relays get rebuilt faster with the help of the Reapers and less people starve or whatever, but Shepard never sees his crew again. In the red ending, relays are rebuilt much slower because there are no Reapers or Geth to help and people die. But Shepard gets to live on with his crew, and we get to see what happens with him and his LI, possible kids. Other stuff we've done will dictate what species' survive the relay rebuilding period(like which crew members survived). Will the Krogan not kill themselves in the meantime? Does Palavan have enough left there to rebuild and not starve because we got the Krograns there in time? Will what's left of the Sol fleet turn on eachother? I have no idea how they are going to explain the Normandy leaving the battle without Shepard though. I'm probably wrong about the specifics in my example, but it will probably go down that path of thinking.
Each path will have it's own pros and cons that will hopefully be used in the next Mass Effect Series. That kind of stuff, at least I hope.