What do you mean?
Changing the design happens during the pre-production. This will not effect any games retroactively. As unfortunate as it is, until the EU parliament decides on a law or regulation all games destined to die will die.
Any games that are grandfathered in, would be done so by the good will of the corporations if they do wish to.
The initiative's issue isn't with them being online-only (though personally people hate it). The initiative aims for games to have the ability to have a reasonable state of playability past the end of life.
This is for all kinds of games - single-player, multiple player, live service, only only. The point is to keep what you paid for.