I see you watched PirateSoftware's video. I encourage you to watch Ross's response.

TL;DW this isn't a proposal to make current games or already dead games left in a playable state. The proposal is not retroactive. It's about the future. In the future, when this law is present, software developers will have to sign licenses that allow them to leave the game in a playable state. That means, they will have to adapt. It was possible before and it can be possible again.

Also, read the FAQ

Q: Isn't what you're asking for impossible due to existing license agreements publishers have with other companies?

A: For existing video games, it's possible that some being sold cannot have an "end of life" plan as they were created with necessary software that the publisher doesn't have permission to redistribute. Games like these would need to be either retired or grandfathered in before new law went into effect. For the European Citizens' Initiative in particular, even if passed, its effects would not be retroactive. So while it may not be possible to prevent some existing games from being destroyed, if the law were to change, future games could be designed with "end of life" plans and stop this trend.