Allowing people to continue playing games that they legally own, but cannot access due to shuttered services, will destroy the videogame industry and undermine the copyright law. At least this is how the Entertainment Software Association, a trade association representing some of the largest game producers, would like you to think. The ESA, along with the RIAA and MPAA, have written to the Copyright Office in opposition to proposed exemptions to section 1201 of the Digital Millenium Copyright Act.
The exemption, being pushed by the Electronic Frontier Foundation, would offer legal protection for the purposes of preserving abandoned games. With many games relying on servers being maintained for DRM or online-only games, gamers are increasingly finding themselves being unable to return to old titles.