There'd be lots of value in being able to revive people who died a long time ago, if only for their value as contemporary witnesses. Hell, a few years ago the scientific community went pretty crazy for some frozen dude we found in Austria, and that one was thoroughly dead. [1]
We already don't have anyone left who remembers the First World War. In a few years, we'll lose the last Holocaust survivor. Wouldn't it be nice to be able to preserve some of that first-hand experience? And come on, how cool would it be to be able to unfreeze an Ancient Egyptian, or a bunch of people from the Middle Ages?
I agree that the future probably won't have a use for a whole horde of our living dead, but I can see there being quite a bit of interest in reviving a few hundred or thousand people - and once you've gone to all the trouble to develop the technology, maybe it'll be cheap enough to go to the trouble of unfreezing everyone else.