I don't think that's what he meant.. or at least hope not.

I would image he simply means we cannot add third party repositories ourselves in the "closed" mode operation of the device. Where someone said above that people will make their own repositories instead of using extras if it's not the official repo.

So, essentially if Extras is enabled by default then users will be able to use it in closed mode (regardless of DRM, I would hope...) .. whereas if it is not - then users would be unable to add it.