Something I've noticed - I hope I'm not voicing something, other people have already said - about the notes is, that they sound very vague on specific items. Also, I think that there's some misinterpretation of various quotes going on.
1. You don't need to know the answers to the mass effect universe.
People seem to think that this quote was meant as "Nah, we don't give them closure." but it also suggests that - as almost every good designed universe - they wanted to preserve a certain level of mystery in their universe. Actually, I don't need to know for HOW long the Reapers have reaped and it never really mattered to me (my opinion). People might see that differently, but for me that information was nothing I would die for to know. Would you? I definitely want closure, but not full closure so that the whole universe gets de-mystified.
2. I will not say that my speculation is correct, but the sentence "Lots of speculation for Everyone!" can be interpreted two ways. First, of course, Walters could've meant the fans, so that the ending would be very speculative. Second, though, it could be interpreted as a note for colleagues. The latter option seems weak, but I'm only considering it because of my conclusion.
3. People say the Indoctrination theory has been dismissed by this, but actually, the last quote of the opening post hints otherwise. They wanted to integrate a Shepard under full reaper control sequence, but "gameplay mechanics proved too troublesome". In conclusion, the ending that we've got could then possibly be a substitute for this sequence - thus giving the indoctrination theory even more credibility.
4. The star child - according to indoc. theory - would still be a valid part of a good ending (read: not the ending we've got) but it would not be the end of the game. I agree, the wording of the quote suggests that Walters thought the "Star Child->The End" a good idea - which would be quite naive - but it never says that the star child was the ultimate ending and that there wouldn't be anything else. There are no quotes regarding how they thought about other endings. There are only bits and pieces which could be interpreted either very negative (and with the state of the end and the player base that would naturally be the case) or very non-descriptive.
So, my conclusion, I was working towards: If BioWare stated that they like their ending because they wanted to get this much media attention, why not cut a deal with Geoff to publish certain parts of the developing process, or even worse, feeding him wrong information "just in case". I know, this sounds a lot like a conspiracy theory and I'm not saying that it probably is as I stated - nor is this meant as some kind of salvation for BW ****ing up ME3's end. But BW has been pointing in several directions, there has been rumour and some things in this story (and I mean the story about the bad ending and BW liking it the way it is) just don't make enough sense. It feels like a very devious PR stunt - for which I would still be extremely mad at BioWare (still not as enraged as I would be about the fact that the current ending is the real one).
Maybe that's just my last grain of hope speaking here, making me see ghosts were there are none, but I think I'll "hold the line" for a little while longer, not buying DLCs, but watching BW warily how they handle this crisis.