For Classic to be a test of nostalgia it would require for its entire playerbase to be a former Vanilla player.
The thing is, there are more players who never played vanilla than actual vanilla players.
From a small research in 2013
https://www.statista.com/statistics/327289/years-wow/
I know this is a very small research and feel free to point it out but out of 3550 players 55% never played Classic.
What do i want to say by this?
Classic will be a test of times.
It will be a test if oldschool RPG design olds up to todays day and age.
A question we have all been speculating about on MMO-C for years!
If Classic fails is not because it was all nostalgia...it was because todays kids dont enjoy oldschool RPG design.
Its impossible Classics failure will be due to nostalgia when the majority of people playing Classic never played in Vanilla.
(in my opinion...and with a small pitiful research to back me up)