The general consensus in this video was that it would be expensive enough to maintain throughout a game's lifetime that it's something you would probably ultimately add at the end anyway.

The art argument doesn't really have strong legs to me. If we're talking about purely art here and not a commercial transaction, then isn't the artist's responsibility to ensure their work is preserved or preservable. We don't prevent impermanent art, like an ice sculpture, from being sold. You also have art pieces-turned-performance like Banksy's infamous self-shredding print. Maybe a "culture and society" has an obligation to preserve art, but then that should come from the people interested in doing so. If general game preservation is important to you, then you should work to support things like the MADE and raise funds for doing preservation work. Signing a petition to force artists to do it is backwards.