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I realize that command blocks have lag issues associated with them. Having said that, I believe they could be beneficial if used sparingly (once per 16 chunks for instance); only people with OP status in Creative mode i.e. admins can edit them, and as someone who became quite brilliant at writing code for them in Exadia, I think you'd be truly surprised to the extent they can be used, especially since CommandBook mostly works with them. Ask me a ridiculous idea for something you want to see in Minecraft, and I can probably give you the code to make it happen with a command block. In some cases, I can probably even create workarounds for plugins yet to be updated.