Is the core problem simply one of space? If all packages fit on HD-DVD (Blu-Ray) for example then we no longer need separate spins? (forgetting for now that there is no mass market penetration of said devices).
Will there ever be a removable storage unit large enough to hold all available packages, probably, as flash moves along.
I have not bothered with DVDs for a long time, preferring instead to use network boot as it's just cleaner/faster for me. It can be handy though to build ones own DVDs with specific package sets.
Although with 8,16,32GB flash memory more common I'd rather just use a simple application to select the packages I want a "burn" then to a USB storage device, from which I could then boot/install.