It is difficult to get dungeon groups running, WotLK dungeons are going to be run all the time for the first few months I’d say roughly the first 4. But just like what happened in TBC (not so much classic) People are just gonna stop running dungeons or they’re rarely run.
Nearly all dungeons aren’t run especially 1-60 dungeons and when WotLK comes that will go to 1-70 dungeons. LFD enabled leveling characters to get into dungeons and let them take a break from the monotonus leveling pattern and instead, expirience a dungeon that they either might not have done in a long time or just haven’t done at all.
Currently only a select few are consistantly run, LFD would make all dungeons be run more often, it’s removal is poinless, all it does is slow down the game.
LFD was automated sure but compared to being effectively afk, spamming LFG with messages for who knows how long, I’d take automation over that any day.