As far as I'm concerned, if game studios simply had ISOs/ROMs of their abandoned games available to download for a nominal fee that would be acceptable. Heck with the advent of browser based emulators Sony, Nintendo and Sega (plus many early PC game rightsholders) could simply sell access to play their back catalog on their website Netflix-style via these web-based emulators, much like how archive.org handles it

Honestly I think the most achievable solution is an abandonware law that basically permits the free redistribution of any software that isn't available for sale in any standard format for x years. Basically just codify what many companies already practice which is turning a blind eye to abandonware/rom sites distributing the very old games they aren't selling anymore