There is clearly a split between people over the lack of the drive, but that's purely down to what 'technical' lifestyle that person still leads.
I think we've all established there will be a day when its normal for us not to have any physical media... its perhaps a case, for a percentage of people, of a little too early by Apple, especially whilst internet speeds are what they are.
Personally, I've not purchased a CD for over 6 years. The last DVD I purchased was about 2 years ago... if the mini did have a drive, I probably wouldn't use it, so I certainly won't miss it. I'm also very fortunate to have 50mb broadband.
I buy Apple products, much like I'd buy a Mercedes (if I could afford one)... they do things years ahead of others... some things seem ridiculous or unnecessary... then 5-8 years later its industry standard.
In all in, trying to look outside the 'box', I guess, for the sake of a slightly bigger box, apple should have provided the drive to satisfy the fact a fairly large percentage still use physical media.