I think there's a fresh version of classic wow releasing today.
Season of mastery was released Tuesday, its just standard classic with some minor changes. the main ones being a 40% boost to quest xp, new mechanics for raids, and no world buffs. Also it is a "Season of Mastery" meaning the servers will only be up for a certain amount of time before they are eventually wiped clean for the next season.
I dont really see this causing problems for the server as I think the charm of vg is the fact that you can still log into the characters you created 10 years ago and everything you do on them still matters because there is always people here. VG out lived Classic, If you log on to a retail classic era server right now there will be 20-30 people online max, and thats with server clusters. Meaning there are more people online on VG then there are people logged into all NA PvP servers combined.
TLDR:
VG never dies.