The entry on the GOG.com wishlist has 36K+ upvotes with a new comment posted every week or so. Seems like low hanging fruit for someone at EA to make a quick buck.
The problem is, a game is not owned by single entity. There were multiple persons and organizations own the game.
Some persons are now deceased, some organizations are now bankrupted.
It's almost impossible to find all entities who own the rights, negotiate the share. It costs more than the potential profit of the old games.
What we need is a copyright exemption law(or recognized as a fair use if you're living in US common law system) which allows unlimited use of copyrighted works(including commercial use) if the copy of the work cannot be obtained from the author.
Some may argues that they want the right to not distributed, but the very reason copyright exist is to give temporally exclusive rights the the author for... you know what? distribution. If the author don't want to distribute their works, it's shall not be copyright protected in the first place.
Also the games aren't 100% unavailable, they're perfectly available on their original platforms on the secondary market if you want one badly.
That is because there are statutory damages to copyright violations. By definition, any violation causes a fixed amount of damage.
Some nintendo games are currently not available anywhere (from nintendo or from original publisher), but if you copy/download that rom, you can get fined due to fictional losses for the copyright holder. What losses? If you're not selling the game anymore, how can you have losses from it? If you're not selling that movie in my country, how can you show a loss from me downloading it?