The initiative start with the game "the crew", where ubisoft shut down the servers and you can't even play singleplayer. The argument is that your product can be removed without your consent. The counter-argument is that it is not a product, it is a license.

The best possible outcome is that developers be required to keep games playable if they don't want to maintain it anymore,by either updating the game to work offline or providing lan/private server capabilities.

It might just end up being a warning when buying the game like "this is a license, not a product: access may be revoked at any time"

You buy a game. Every time you start the game it phones home for permission. The company decides to shut down the server that gives permission. You can't play the game anymore. If this is like other initiatives in the same vein it won't stop the game maker from shutting down the server, but it will mandate that they either open source the server so you can run your own, or build the game in such a way that you can still play it (maybe single player only) after the server is gone.