But it is! So here's to the next twenty years of blasting demons, gibbing zombies and smashing pumpkins into small piles of putrid debris.
Also: Chocolate Doom released version 2.0 today; DOOM RETRO, a new port based on Chocolate Doom released its first version. Furthermore, here's an interview with John Carmack for the 20th anniversary, and IGN played Knee-Deep In The Dead with John Romero (90 minute video!). And finally, Doomworld's got the 10th annual Cacowards honoring various worthy WADs and mappers of the past year.
EDIT, 2013-12-26: here's a massive list of links for the occasion, compiled by Chris Hansen.