I think this is the correct thing to do as far as copyright law goes, but it seems to me that copyright terms are far too long to fulfill their original purpose: incentivize the distribution of creative works. Originally copyright was for relatively short terms (20 years IIRC). It is now life of the author + 70 years or 95 years from publication if the copyright holder is a corporation. Some organizations advocate for perpetual copyright terms as well.
Given the extremely long terms now available there is little incentive to quickly extract value from the copyrighted work. Patents exist for the same reason and have been similarly coopted by their holders.
Edit: if copyright terms were shorter publishers would be incentivized to keep their games in print and to update them for newer media/platforms.