I must admit, I've been quite surprised by the general apathy of a lot of responders, in the way so many people have seemingly quickly shrugged their shoulders with a meh.
Yes, technology does change, rendering games both unplayable and uncomfortable to play without current comforts, but that doesn't mean they need to or should be just forgotten to time as the best possible outcome.
The wonderful thing about technology is that it gets more powerful. Most of those really old games would likely fit on your laptop with room to spare. It really wouldn't take too much technology and space-investment to have an online museum of games, as @Pladio; alluded to.
This museum could be both a charitable and for-profit operation. It could, basically, be a database storeroom of every game made in the 1980s, for example. You could either enshrine in law or simply appeal to the good nature of developers to suggest that, after a given amount of time, say 40 years, they agree to cede all of their rights to the game to the museum.
The museum then provides an online presence for all these games, for anyone to play anytime, if they so wish, either online or via a download, for the sum of $1 a pop. The museum's job will be simply to ensure that the games are software compatible with whatever is the latest operating systems.
Their job wont include patching the games or improving them or in any way making them 'better' experiences, they'll just provide for a system that allows people to play the last or best loved version of the game.
An element of curation would be involved so that games which were broken upon release or are just too pointless generally can simply be in a section of the museum called Trash, where a punter can pay $1 for unlimited access to all of the Trash and if the game is unplayable they can just have an interesting wiki-like page detailing why it was dreck to look at.
So, for example, at the start of 2020, all games made in 1980 get donated. Then, in 2021, all the games from 1981, etc etc.
For neatness, the museum could be 'complete' at 1989, and then a different and new museum opened in 2030 called the 1990s game museum. A skeleton staff would continue to monitor the 80s games for compatibility issues and general administrative reasons, but the bulk of the activity would move onto the 90s museum. Different websites, but the same charity/business.
Its just one option. I'm not saying the above is perfect, it's just the first thought that occurs to me, rather than the first thought of many others, which seems to be just meh. I feel sure we have more options available to us as a society, to which the above is but just one.