because of the (percieved) cost. People just dont like price margins on things, when a DVD takes .50 USD to make, but is sold for 17-22 dollars. Writable DVD media still costs ALOT of money compared to CD-ROM technology, which the common user is very hard pressed to fill up 1 CD with what they want(unless this user is a digital film buff, and comes home with 2-3GB of film every other day).However the track records for these types of products is simply not a good one. Why didn't DVD's technology take off on the computer and replace the CD-ROM???
As to this technology, I agree with skorman it would rock in an RTS; however, I dont see much use for it until it greatly matures.