There are opinions that should and shouldn’t be taken seriously, Classic Era was dead as soon as TBC released. Blizzard saw that and decided that Era servers largely aren’t what people want, or at least that most people just won’t play them. Being on the endless treadmill of Classic, TBC or WotLK just isn’t that appealing to the majority and the only way Blizzard can get people to play era at all is if they put a spin on it.
Hardcore made Classic Era flourish, and in turn, lead to the other modes SoM/D and offical Hardcore servers all of which had varying degree of participation. SoM imo came too soon and even though it had good numbers initially, after a month or so it was heavily bleeding players because people realised it was just Classic Era without anything new (SoI buff can hardly count as something new).
SoD is so popular because even though it’s Classic, it also has something new with that being the runes and the new dungeon turned raids among other things. It’s likely that the other Era servers will behave the same way, good initally then, a ghost town.
I’m sorry but the fact that you found 3 other people in all of the NA servers says very little. Yes people are playing but compared to last phase the difference is very noticable.
Personally I don’t care whether or not WotLK Era servers get put in, but as it stands I don’t see us getting one. Maybe they’ll add them later on in 5 or so years who knows but currently I think Era servers aren’t even being considered because Classic Era set a president that they didn’t like.