The goal posts are being moved, yet again, as the reality of generative AI's usefulness starts to narrow. I think most "anti-AI" devs wanted the technology to be supplemental in the first place, in the hands of responsible engineers. The hype riders are the ones who are saying our job is over.
> reducing the cost
The evidence is the contrary. The tools are become more expensive by the month it seems.
As a more emotions based response to your post: I find it pretty gross that we are ready to accept that this tech should be used in art whatsoever. I think saying this is a barrier-to-entry-lowering tech is a misnomer, because even those who use computers still need to understand the program, mechanics must understand the function and implications of a torque wrench; there is no effort or skill involved with generating slop, you always get a result. Additionally, the first part of your post was to argue that we should be using these tools to do narrow scoped tooling and one-off script, and then you moved to generating videos and music, which shows that you aren't even aware of the "scope" involved in those efforts.