It's not just the PoP era; that can be sort-of recreated on an EMU like projectEQ. The real loss here is the original codebase; the original hp/ac/thac0/damage etc etc etc mechanics are gone forever when al'kabor dies. This original code is also the main reason the shutdown is happening - Hobart is the only person still at SoE who could work with it and they need him to work on whatever continuation of "the vision" they're trying to unfuck (currently Vanguard?).
So yeah, GG smed and bye Everquest 1