I think it will be possible for anyone in the future to be able to recover data from just about any digital medium that lasts that long. After all, there are tools that make it possible to recover from pretty severe disk crashes now. I'm thinking they would have far better tools by then. They will just have to be willing to spend the time on it.
. But I would be embarrassed if they dug up my collection and they found a gold disk with my "Greatest Hits of Weird Al" compilation on it...
Here, have a :beer: !