I don't think I've ever used the ODD in my MBP. The App store and flash drives should make ODD's obsolete. ODD's use far too much valuable space for the amount they're used anymore.
If that space could be used to provide more storage and more battery capacity I think consumers would be happy with the tradeoff. As it is, my MBP is thin enough, it doesn't need to be much smaller than it is. It could use a couple hours worth of additional battery power though. Removing the ODD opens up a number of different possibilities, all of which are more exciting than a nearly obsolete form of media storage.