As for CD's and DVD's "dying away.." I am an audiophile from way back with an extensive collection of CD's in 16/44k & 24/96...etc., that I kick back and listen to thru a killer (Levinson) 2 channel audio system that can wring out the best from redbook 16/44. I listen to my iPod through Sennheiser 650's (and sometimes with the Headroom amp) because it sucks any other way. I burn my CD's at full res (WAV etc.) not truncated MP3 files, there is a huge sonic difference. I am always trying to find ways to make something sound better while the market tries to put the kabosh on me! If Apple would offer MP3's at 24/96 or higher where the iPod can play it, i'm DONE!! Who wouldn't go for that? Right now I found a site that offers super high rez downloads but my iPod won't play them!! So there you go.
As for my Powerbook (yep it's old), I can see the argument to ditch the DVD drive and add an external. It's slow and a pain. Why do people not embrace new tech so readily? They are too overwhelmed by the onslaught of competing and differing offerings and then lose interest, so the new tech can become widely unknown.
The CD was developed with convenience first, NEVER sound quality. When the DVD/Super Audio came out, ppl were again put off by the cost and having to buy CD's all over again at 2x the price! So it died out. IF Apple keeps it competitively priced or lower, I can see a transition. For me, I need to have some kind of CD burner to get my CD's onto my iPod, thus in keeping my old Powerbook G4 (2 GB SDRAM).
I will get a new MacPro at some point, maybe when iCloud and Thunderbolt becomes widely available so I can buy stuff that will use it! The wireless factor is alluring especially at high speed. Who isn't sick of wires?