CDs and Blu Ray are still relevant, at least until digital copies achieve the same quality.
There's no point in having a factory Blu Ray drive in a Mac, as it doesn't support BD playback anyway. Have to buy a 3rd party app. That said, I see no issue in going external for as often as these drives are typically used.
“What the hell did you expect? Leave Vista under the pillow and the OS fairy would make it Win7?” -El Fiendo
“And Bring Mailman back god damnit, he is the Eric Cartman of TPU” -MRCL