Don’t count on seeing any serious lore in game ramifications from the changes. Unless blizzard do a very serious expansion.
as for your other point. That was no longer valid when the skin tone came formvoid elves and the blue eyes for blood elves.
Thalassians became like Pandaren at this point. Hair colour update was inevitable. Failure to do it just seemed silly at this point.
The void elf concept was the attempt to keep them distinct.
What we may see is a building of high elf lore and interaction IF they do a serious expansion.
oh. And unless they give the void elves or high elves a stunning new city. The blood elves may eventually lose Silvermoon.
same for the Nightborne and Suramar.
the only thing that would satisfy alliance fans is if they get just as good or better especially as they feel they are the natural home of the elven races, or they move back into their original cities, ie Silvermoon and Suramar and blizzard actually build Nightborne and blood elves are stunning replacement or just leave them homeless because they are not really needed to be lore catered in the horde because of their very alliance themes