I care about an optical drive on a desktop. It doesn't have to be blueray.
What I didn't care about was making the iMac thin enough to be impractical.
I like the idea of the iMac shedding substantial weight this trip out of the gate. The machine has evolved and evolved and almost tempts me back to the world of desktops, which I abandoned decades ago. Almost. Going where the wall juice is still seems tedious. But if I did get the iMac now, I personally would not have a problem using an external optical drive with it.
As for opticals disappearing from laptops, I was skeptical at first and still have a workhorse MBP with one, but I did go for the MB Air last time I decided to get a newer laptop. I rarely use the MBP's internal drive now except for Netflix and I only rent discs from Netflix because my DSL is too slow for streaming. If I like the movie I rent and figure I would like to see it more times, I usually try to buy it from iTunes because the digital format is so much more convenient.
It annoys me that I can't take my purchased movie DVDs and just run them through iTunes to rip them to digital the way I can with purchased music CDs. Not being able to do that has negatively affected my rate of purchasing movies on DVD, that's for sure. It's too bad, because there are lots of movies I can't find in digital format that I would buy on DVD if I could rip them without feeling like a criminal and having to muck around with the rips instead of inserting the disk for iTunes to offer me "Import" on a menu.
A little drift here: Seriously, the movie industry has its head up its posterior on this subject, they have missed thousands of dollars worth of sales just to me because I'm getting my back up now about sinking money into a format I don't want, and about not being able to convert from that format to digital. I sometimes just go out for a walk now when I'm tempted to buy an old movie on DVD that I can't find in digital format. I hike around for awhile to get that movie out of my brain and off my shopping list. I'll forget about it in 20 minutes. It's the industry's loss, not mine.
Anyway I'm a convert to the no opticals in portables. It took me awhile to think it through. There is still the external option. I'm sure it also took me awhile to get over thinking that Apple ditched internal 3.5" disk drive slots too soon. Big deal, so I got a ZIP drive to get me past the era of 3.5 disks. Human brains resist even reasonable changes because it takes energy to work up a new autopilot script. The brain would like everything to be on autopilot. It takes effort to override that and tell brain who's the boss sometimes.
On the chances of Blu-Ray in Macs: Schilller is probably right that people aren't asking for it so much any more, but so are MacRumors posters correct who suggest that Apple's staunch "we're not going there" attitude is one of the reasons people have quit asking. I admit not having a dog in that contest since I'm not a connoisseur of video quality. How could I be when I'm willing to watch my purchased iTunes TV shows on a 3rd gen nano screen

in a kitchen speakerdock?!