I wasn't aware that itch was a free game assets site in the first place.
In any case, it's pointless to worry or speculate about the future. If you're an artist, keep making art - you'll keep getting paid next to zilch for it regardless of AI (which at the moment is mostly a lot of smoke and mirrors). If you're a billionaire, keep being a parasite - you'll keep getting paid a ton for it, regardless of anything. Eventually, we will all die. Eventually, the sun will burn out. The future doesn't actually exist, in any case, any more than the past does. From within our limited and ephemeral locus, it's just a horizon we will never reach. Only the present moment can be said to be real, and even that's questionable at best.