Even though it is only a command, it absolutely amazes me how much people whine about such dumb things.
The people who say locked chests would make ender chests useless. >.>
I don't understand peoples reasoning. I like when they add useful things even if it makes another item less useful. More options is always better in my opinion. The ender chests would still have the capability of transferring items form one place to another with out having to carry it. That capability alone make ender chests very useful even if you no longer needed them to lock items up.
But seriously, out of any game community forum I have ever been part of, the Minecraft forum has the most whiners. -.-
There are times when they add new features that are so cool, that is hard to imagine why anyone would be against it. If you don't like change .. then simply don't update >.>
If you appreciate your innocence, never play MOBAs.
Especially LoL, (damn those kids)
Back on topic: I can see a new hypixel adventure map coming along from this and I can also see sethbling making awesome stuff with this so please guys, I seriously doubt that it won't be as simple as typing in a really easy command and not much will change for the people who just enjoy the game, just hardcore people who want a full experience for the people around them, I think that it probably won't change much in servers and in then end we will probably get better stuff being produced by the community.
You can access an ender chest from anywhere in the world, even across mutliple dimensions, you can't do that with locked chests.
Secondly, in no way do they impact regular survival gameplay, where enderchests reign supreme. The locking is only intended for adventure maps, as they can only be locked with command blocks or NBT editors. They do not function for survival gameplay.