People have always optimized to do Vanaduke. If there's nothing to do, people just - farm. If it's not that, people are usually merchanting. Repetitive, boring cycle. There's no luck in find games as most of the time they are orchestrated within guilds or friends (or friends of friends). You have Crucible and BN, but those are heavily orchestrated and alt farmed (players like Whimsicality/Dawnleaf and other people do this).
Nowadays people either troll, do personal or guild events, merchanting, and stalling in Haven. Even with the "player peak", people are still static with anything other than PvE.
2015 was when players became more inactive. Vana was already a routine before it became normal and that was due to the fact that Lockdown had no substance and player count was shrinking. VHs and UVs are easier to get now due to a heavy amount of whales and the supply and demand for CE/CR.
So yes, all of it is dead, but there's more deeper reasons than just player count, which I did discuss in another thread created by Rmanami.