Of course Apple benefits from the removal of optical drives more than any other manufacturer since they have a large control of digital distribution with iTunes and the Mac App Store, but the future was shaping up towards digital distribution even before they introduced optical drive-less computers like the MacBook Air. They just have been smart enough to invest in what they believed in and thought was the future (legal digital distribution) and it worked very well, so good for them!
But you still have to see that optical drives are becoming obsolete, and not just according to Apple. Even manufacturers who don't benefit from digital distribution are all making new laptops without optical drives now (mainly what they call ultrabooks). Apple of course pushes new trends before most other manufacturers, but that's just how they are and always have been. See, they decided to kill Flash even if they didn't benefit from its "successor" (HTML5), they killed floppies before they had a digital store, and they are now killing hard drives and the ethernet port.
Some people are not ready for this transition to digital distribution just yet, and it's probably one of the reason they decided to keep offering the older 15" MBP with new internals. It's just as fast and has legacy I/O for those who aren't ready to ditch it yet. You can't get a Retina Display with it, but Apple has explained that the process they use to make the screen and fix it to the lid is different, so it would not have been compatible. They could have made a separate Retina Display for the legacy MBP, but they already offer 3 screen options on it (glossy, hi-res glossy and hi-res matte) and it's understandable that they don't want to have to produce a hundred types of screen for an older-generation model and move forward with their new products and focus on the future, like they always do.
But you still have to see that optical drives are becoming obsolete, and not just according to Apple. Even manufacturers who don't benefit from digital distribution are all making new laptops without optical drives now (mainly what they call ultrabooks). Apple of course pushes new trends before most other manufacturers, but that's just how they are and always have been. See, they decided to kill Flash even if they didn't benefit from its "successor" (HTML5), they killed floppies before they had a digital store, and they are now killing hard drives and the ethernet port.
Some people are not ready for this transition to digital distribution just yet, and it's probably one of the reason they decided to keep offering the older 15" MBP with new internals. It's just as fast and has legacy I/O for those who aren't ready to ditch it yet. You can't get a Retina Display with it, but Apple has explained that the process they use to make the screen and fix it to the lid is different, so it would not have been compatible. They could have made a separate Retina Display for the legacy MBP, but they already offer 3 screen options on it (glossy, hi-res glossy and hi-res matte) and it's understandable that they don't want to have to produce a hundred types of screen for an older-generation model and move forward with their new products and focus on the future, like they always do.