The main problem with you is that you think you are "the ultimate majority of the consumers", when, mixing some neogaf posters, some bioware forums posters, random internet guys, you got, what, 3% of the game's players? And yet you think the developer should change the game's ending based on what you think. smh (to be clear, I don't think changing it was going to be ok even if you represented 99% of the gamers)
For the sake of argument, let us assume that the Charity is not a representative sample.
This isn't so much of a problem of "just a bunch of forum posters" being up in arms about things. You go to any other major community outside of GAF and Bioware's forums like IGN, Gamespot/GameFAQs, Something Awful, various individual and smaller forums, etc, and even with some degree of overlap, you have a fair amount of people being concerned about things. Even for a small frame of reference, look at GFaqs, in which at least 30k people do agree that there is
something wrong with the ending as is. And even going of anecdotal accounts like facebook and what-not, and now areas like Forbes giving some insight, saying that it is only like 1% of the people who bought the game is pretty disingenuous at best.
Psychological or academic studies do not become less valid simply because they could not gauge the
entire population in question. Instead, there is enough support that there is a very good chance that there is a somewhat consistent sentiment and concern.
True, I can concede on the notion that not
everyone wants it changed. But I think the most pressing scenario here is that we could possibly have a significant number of people who just found it problematic in general. If Retake ME3 is the only outlet to really show this notion, despite how less-extreme arguments may also be accompanying the concern, I'll take it.