And, they are not difficult to lose. (The voice of experience...)
Of course, a small case the size of a DVD "jewel box" could hold a hold lot of them...
If Apple does drop the DVD reader/burner, I suppose they could offer a USB external along with the MBs -- plus some nifty sort of SD card "caddy"...
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Without realizing it, we have arrived at the time where Star Trek's pocketable, transportable "Data Crystal" is not only a reality -- but is becoming commonplace...
I think the SD cards are physically too small to be a truly practical medium. They can get lost in the folds of your clothing or between the pages of a book. They make no sound when you accidentally knock one off your desk. They must be tweezed in and out of their slot with your fingertips. Making them a little bigger and more massive would actually make them more practical.