Under current copyright law in the USA, we're talking about Super Mario Bros becoming public domain around 2075. A number of games will no doubt remain known, one way or another, much like some very old movies remain interesting and known, but a good portion will fall into the bin of "meh, who cares". I mean, a huge number of games are already almost entirely forgotten.
CodeMaster religiously hold onto their copyrights. I remember searching for their 8bit games of the 1980s and while copies are out there, the places that do it legally, World of Spectrum for example, don't host them because CodeMasters refuse permission for these old games to be distributed for free.
I envision a future in which everything is cracked and we can all play whatever with super low latency because we live in a big sphere city in outer space.