Not having no value, but being of less worth to investors and companies to invest in. This is simple fundamental economics, since game prices are not growing as fast as their input costs. For example, I spent $30 for Atari video games in the 1980s and it was a lot less expensive to produce. That game would cost $90 today with inflation.
For a comprehensive breakdown, see https://www.gamesindustry.biz/are-video-games-really-more-ex...
If your costs are increasing and you can't raise your price then your industry is being commoditized, or at least in a real quandary about how to move forward. AI could be a way to slow the huge, up-front costs that go into AAA games and help limit the risk to making new ones.
If this subject interests you, there is a great long-form interview with Matthew Ball on Stratechery: https://stratechery.com/2025/an-interview-with-matthew-ball-...
Anyway, Carmack is right on the money on this one.