Exactly; at the end of the day, due to not being a major playable faction, the Silver Covenant rarely gets any focus, yet still they have repeatedly showed up since WotLK. Like a big part of the request for High Elves on the alliance comes from the game itself continuing to use them as members of the alliance -even when they are never the focus-
TBH I would like if the SC and the Void Elves started to work together, or even merge. Would be fun to see some previously HE members show up as Void Elves.
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I do think you are thinking the term "Civil War" in a limited sense; basically I mean a conflict where two groups of a same people want to uphold political supremacy of their people, it's different than a war between two different groups of different origins. I mean Civil War in that sense, conflict within the same people.
Sure Alleria and Vereesa want reunification, but both clearly have expressed it to be under the Alliance, so that would likely lead to open conflict if pursued.
And if you are referring to blue eyes blood elves, sure, we might interpret that as High Elves rejoining QT, but without confirmation that's just speculation, might as well be BE's that regained, or never had, blue eyes. Either way is speculation, hardly confirmation.
But what we do know is that a group of Blood Elves got recently exiled for using Void, AKA the Void Elves, so that's a far more evident argument for their division. I do agree that the animosity is not as high as it was after the Purge of Dalaran, but it's clear that both sides think they are on the right here; with Vereesa believing "BE's can be redeemed" and Alleria outright stating she wants them back on the Alliance, so even if some High Elves have returned to QT -which again, speculation, but likely- doesn't reflect a large scale road to reunification under the Horde.