We've had High Elves living in Silvermoon since the Quel'Delar quest chain, but the key here is:
How important are they?
I mean, these High Elves have been living under Horde law since that time. So, that's during the Purge of Dalaran incident, which was a major divide between the relationship between High Elves and Blood Elves.
Now, I don't think the High Elf fanbase want the High Elves to be like this. Arator is an example of living in Silvermoon, but he is subject to and under the Horde law, because Lor'themar is a Horde leader. The same applies to the High Elves who perhaps made their return during the Quel'Delar chain. The thing is - Silvermoon won't change to "neutral" via the lore, because Blizzard couldn't have made it anymore clearer through quest npcs and through the Sin'dorei navy, that this is a Horde location.
This throws the question of how important are those High Elves in Silvermoon? Or, are they now just considered to be "Sin'dorei" since they haven't offered anything additional to the overall story since 2010 and that was before the two major incidents which severely hindered the relations between High Elves and Blood Elves (Theramore's Destruction & Purge of Dalaran). Have those who moved back during Quel'Delar, just decided to join Silvermoon, join the Sin'dorei and therefore, join the Horde by extension?
Is that what the High Elf fanbase wants, because I'm not sold on it.
Silverglade Refuge isn't big...but it's big enough for the purposes of an allied race introduction. Not even @
elbleuet could deny that