1)I never said optical would NOT die...some day it will. And for all we know we could be using little USB Key thingies instead (no moving parts required) or cartridges like the old Atari 2600 days.
2)"Teens" is a very small age bracket...13-19. What about all the folks in their 20s, 30s, 40s, etc? They're people, too.

I'm 41...100% of my 20-30-year-old cousins as well as 100% of my nieces and nephews (all 6-12 years old) still have and use cd audio and dvd. Sure...some purchases are iTunes songs but they all still have their $9.99 cds that they can bring and play anywhere. Not every 9 year old has a $150 iPod.
I see both sides of this coin...people have been yapping about a digital-only world for decades. People are human...we like things we can touch and hold and store in our bookshelf. We question the purchase of a "service" that provides a virtual object.