Thanks to Icecrown all casual players have left Lordaeron, which is awesome. Let them go. I fully understand that hardcore and challenging progression realm is really not for everyone, and certainly not for modern style players, who got used to easy and available, sometimes less mentally demandable gameplay. Totally cool with that!
Molten team does very well to allow new players to catch up as well. Naxx 10 and certain Naxx 25/Ulduar 25 bosses have had their HP reduced, so if you are new, you won't have any issues getting into end-game. Yes it will take some time and effort, but I guess that's why you are playing on 1x with no blizz perks?