Unfortunately it's probably going to take many more multiple TB losses (resulting in failed prosecutions) for them to take this seriously with digital evidence as well.
One of the things I find nontechnical people tend to fail to understand is the importance of organizing and cleaning up data. Often when we are running out of space, I get asked why we can't just buy another hard drive at Best Buy for $50.
Then when people do clean up their data, they don't understand file space. They'll spend hours cleaning up old Word documents, but not touch the decade-old AVI video files which could at least be stored in a better format.
Ask a government entity to buy a SAN, they complain. Ask them to buy a backup storage appliance, they ask why we need another SAN. And then in five years, they ask why you need another SAN if you bought one five years ago...