Maybe we've just had different experiences but from what I've seen when it comes to Junker Gnomes is everyone already knows they're an inevitability so most are just expressing their resigned disappointment. Aka "wow so lame that they're coming but whatever". For Lightforged Undead I've just seen not much talk about it at all other than a few speculation it might be happening because of Calia, but it's obvious so few people read Before the Storm and thus the only talks on LF Undead is "I hope not cuz they'll either be Alliance or it's just same Undead but Holy".
I feel Junker gnomes will receive the same reception that Kul Tirans did: muted excitement, but acceptance. Because what can you do other than accept the reality of that?
Nope, disagree with the bold. If High Elves were actually confirmed, then most of the opposition would go off to other topics. Opposition is "loud" right now because they haven't been confirmed.
Like I said, look at the opposition to straight back Orcs, Demonhunters, Transmog, Classic etc the years before they were confirmed. Player opposition was loudest then. Once confirmation hits, you get a bit of "WTF" and then it quickly dies out.
Look at Nightborne addition to Horde when it was confirmed vs before it was confirmed. Much more threads beforehand against such a notion vs much less afterwards and a bunch of "I can't believe this is actually happening!" and nowadays no one gives a fuck. Just like the many other things people opposed before WoW finally added them.