Disk media isn't going away for quite some time and Apple of all companies wouldn't be the first to make the move. Given that they all ready take heat for adopting storage/media formats last (SD cards, blu-ray, etc.) I'm sure they don't want to be the first to just axe it out altogether.
Plus, more importantly, in order for any company to make the move to axe out optical disks there would all ready need to be a very large portion of the market using another format. In other words, if everything was going to go to SD Cards, companies would have all ready had to start shipping movies, music, software, etc. on SD cards and the market would have had to have been buying those for a few years. That way, by the time a company axes out optical altogether it's not as big of a deal since the majority of consumers would all ready have a majority of their library on SD.
You also run into security issues. I'm not quite sure how high SD card security is and I'm sure movie studios don't want you to be able to easily copy their movies or software. Finally, I suppose, not everyone has an SD card reader. Granted, I'd say by now a majority of older machines (other than Apple's) all have SD card readers, but there's still a huge population I'm sure that doesn't have them and probably an entire generation (elderly) of people who wouldn't even understand it. Everyone has a DVD drive and everyone knows how to use it.
I wouldn't be against the idea. In fact, I like the idea of buying SD cards for everything instead of disks. Easier to carry things around and it'd be cool to walk up to a vending machine and buy a movie and the movie is just an SD card that you can put into your PS3 for 1080P viewing or your phone. Obviously, wishful thinking.
But, don't expect this happening for another 10+ years, if ever. There are simply too many DVD's for everything in the world to make this happen any time soon. Don't expect a change in optical until companies start shipping products/software on something other than optical. You have to get the software out there before you can make change to the hardware.
Lastly, no one going to just stop making DVD software because Apple (an 11% market share worldwide) stops supporting it and thinking otherwise is just delusional.
