Love the idea of putting organizations on a "Data Diet". Hoarding all data in sight just in case there is some buried nugget of intelligence waiting to be tapped into is no different than being a pack rat at home and not letting go of useless junk just in case. '
The common rule for de-cluttering our living spaces can easily be transferred to organizations being data pack rats. If no one missed a certain something in the attic, garage or basement for a year or more then it is time to review its need to exist. Most often the item in question will be revealed to be an impulse buy whose time has come and gone or just plain old junk that need to be trashed. Likewise will cold or dead data.
The promise of hidden treasure in a data dumpster is just that - a promise. Very rarely does it get fulfilled. But everyone is out there hoarding everything they can just so they don't miss out if and when technology becomes smart enough to do something fantastic with it.