A Mac Pro without an optical drive? Now that's just silly...or at least it's silly for our time. Might not be so silly in a few years. Just about everything related with media storage is more reliable, easier, and portable with flash drives. My friend does wedding photography/filmography for a living, and he completely ditched dvds, and uses custom flash drives with custom embroidery designed for each wedding theme.
I don't fault their argument in wanting to switch, I just believe people are afraid to completely ditch the cd/dvd format right now.