"slop" is less so about if something is a popular product or not, it's more about the quality. You can think that AI can produce high quality outputs, but it's unreasonable to think that this applies to the majority of it's use. There has always been corner cutting, and using AI to cut corners/safe money in product design/production inevitably results already, and will more so in the future, in a ton of bad products. That does not mean that there can't be good ones too.