Single player PC games are a small fraction of the market these days, and once people have a job, they are generally happy to pay for the things they like.
I think the "clean room" Photoshop example is much more interesting because Photoshop is far more expensive and Adobe has a semi-antagonistic relationship with creatives.
What I hope is that we don't just end up with a bunch of vibe coded clones, that may or may not contain AI introduced bugs or even malware, that get uploaded without being run/tested and then become instantly abandoned. Instead, I hope that AI's ability to help decompile software helps people develop open source projects that are maintained and further developed to go beyond what the commercial software was capable of.
Demos are (up until this week) the #1 for studios to do marketing.
Marketing will change now, to more socials being required (YT etc), and even then only small bits here and there as decomp will happen from video as well.
The marketplaces that adapt to this and enable devs will help, hopefully.