This has been an issue for some time now. Preserving culture for future generations is going to be increasingly difficult as we move forward because so much of what constitutes culture today is privately owned and protected by incredibly complex law - often for hundreds of years. This means it will fall to copyright holders to make culturally significant works available over longer periods of time, which they're not obliged to do and might actually take pains to prevent.
Consider that things like Gershwin's Rhapsody in Blue (1925) and F. Scott Fitzgerald's The Great Gatsy (1921) are still under copy protection (due to lift in the coming years) and then wonder how long it'll be before well-meaning archivists can legally start redistributing seminal gaming works created in the eighties and nineties.
With video games, it's even more complicated on account of the fact that the end product is compiled and can't be easily translated into modern mediums without reverting to the source code. Software emulation can often bridge that gap, but the quality of emulation varies wildly depending on the software/hardware.
Will companies be forced to release source code when copyright expires? What if it's been lost or destroyed? It's a big murky area, but two hundred years from now, I find it hard to imagine that we'll have the same ease of access to - say - The Legend of Zelda series that we have to the published works of Henry James, Johannes Brahms or Percy Shelley.
