If you’re saying that a change like SKG would lead to developers needing to take a perpetual license then you should say that rather than alluding to it with a non-sequitur like this.
If that’s what you mean then I’d say maybe but doing so would definitely increase the cost and complexity in using licensed content. Which is likely to be passed on.
Interestingly though reading the EU petition and the petition authors views it would be fine to remove the content once the licence expired.
Developers already need to license whatever they're licensing in perpetuity, since they need to sublicense to the people who buy their games (regardless of format). Otherwise, they wouldn't be able to sell you the physical media. Licenses aren't yes/no affairs.
Stop Killing Games doesn't change this in any way.
No they don’t need perpetual licenses for physical copies. They just need to stop distributing physical copies when they lose the license. For example a reissue of a rhythm-action game (or a release on another platform) might be missing songs from previous releases of the same title. The issue with digital distribution is that you can’t redistribute the content once the license has expired. So if someone needs to redownload the game for whatever reason then they can’t provide content they no longer have a license for.
We’re talking about distribution so maybe you’ve come in to the conversation in a weird way there. To be clear the developer cannot continue to distribute content they no longer have rights to. With physical media you don’t go back to the publisher to get new copies but with digital media you do. And hence falls foul of changes in distribution rights.
"Distribution rights" aren't laws of nature. If you're making physical media, you get a license to sell physical copies of the game (containing the licensed material) for a limited time, to people who are allowed to keep them once your sales license has expired.
The digital equivalent would be: you get a license to sell digital copies of the game (containing the licensed material) for a limited time, to people who are allowed to re-download them once your sales license has expired. (And you are allowed to provide that downloading service, but not continue to sell the games, nor make them available to people who have not purchased them.)
It's not that hard – and the existence of Steam demonstrates that many people are already doing things this way.