With the endless ethical and legal issues around GenAI, I would very much hope that Valve continues being cautious (even if it's evidently just to cover their own arses). Once we have models and datasets for AI generated game assets that are trained from entirely ethical sources (artist permissions, licences, etc.) and not just the "scrape everything and train our models from that" approach that is currently used, then maybe it could be a good thing for games. Even still, the generated assets will likely have no copyright (as is the case now), so we'll surely end up at "AI generated content flip games" flooding Steam.