Restricted realms - A realm where certain things are restricted. No Flight, No Heirlooms, No Shared AH, No paladin for horde, no shaman for alliance, Fresh mount journal, fresh pet journal, exp gets turned off at level 60, 70, 80, 85, 90, 100 and wont be activated until you complete that expansion's raid / dungeon content.
Would you play on a restricted realm? Is it time we introduce these realms?