Rose tinted or not, world PVP was a very special thing in Vanilla (and TBC / WotLK in all fairness). Got some very fond memories being in the midst of the huge raids that used to happen and take place in the middle of the arse-end of nowhere, or the huge raids on Stormwind, World Bosses etc.
There's certainly "a" demand for Vanilla, but I honestly don't think that demand is great enough for Blizzard to support it long-term. Elysium is averaging what, 11-12k a day maybe? Nostalrius (when I played it) was similar numbers too. Compared to how many millions on WoW proper? Sure, you'll get a huge influx of people that will want to reminisce or "see what the fuss is about" as they missed it the first time round. But long term? Just don't see it surviving like everyone, myself included, want it to.
There's certainly "a" demand for Vanilla, but I honestly don't think that demand is great enough for Blizzard to support it long-term. Elysium is averaging what, 11-12k a day maybe? Nostalrius (when I played it) was similar numbers too. Compared to how many millions on WoW proper? Sure, you'll get a huge influx of people that will want to reminisce or "see what the fuss is about" as they missed it the first time round. But long term? Just don't see it surviving like everyone, myself included, want it to.