Could someone explain the concept behind the locked servers

[Lazer-3136812 (Lazer)]

Free Character Transfers – Wrath of the Lich King Classic

Hey all, In preparation for the launch of Cataclysm Classic, we will be closing our low-population realms. To prepare for this we are going to be opening Free Character Moves from these realms to other, higher population realms. We are also going to be utilizing the technology introduced recently in Season of Discovery to allow each of our destination realms to hold a far higher number of players than was previously possible. |Sulfuras|----->|Faerlina| |Sulfuras|----->|Benediction| |Sulfuras…

yes locked are dead and will be closed at some point