Yeah I agree. Who would actually want such a thing?
Generally, the same users who sign up for AOL.
Well, there are probably three groups that want it. Microsoft needs something it can tout as a reason you absolutely have to have their latest OS (and this might be helpful -- to them -- with DRM, which they would like). Second, many users think the latest Mu-snot gadget must be the best, so they'll want it. Third, lamer users will probably think this idea is good on its merits, so they'll want it.
I want a content-aware file system about as bad as I want to connect my refrigerator to the internet. Remember that crappy idea?
So you can generate a megabyte of metadata to describe each byte of user data. How else are you going to sell the next generation of hard drives?