Sure, but the laws regarding eminent domain already show that the state can appropriate property if it's considered to be in the public good. Just because something has value it doesn't mean that we have to allow someone to extract wealth from it.
Regardless, I see what you're saying about OP contradicting his/herself, but it's not necessarily a contradiction: the value to society may be greater than that to the copyright holder. Of the millions of works still under copyright today created in 1960, only a handful are still generating wealth for their copyright holders. But could all those works which are not generating wealth actually be valuable to modern people breathing life into old works by republishing or remixing? Perhaps.
Regardless, I see what you're saying about OP contradicting his/herself, but it's not necessarily a contradiction: the value to society may be greater than that to the copyright holder. Of the millions of works still under copyright today created in 1960, only a handful are still generating wealth for their copyright holders. But could all those works which are not generating wealth actually be valuable to modern people breathing life into old works by republishing or remixing? Perhaps.