I believe wholly that the definition of a developer is rapidly changing (arguably has already changed). It's clear that it won't mean people who are "classically" trained in software development. I particularly like the view point that we're evolving from developers to conductors (SpecStory did a nice write up on this [1]) where we are more focused on orchestrating Agents.
I also think that APIs will either need to be ready for AI (trusted, solve for authentication, have clear specification, lots of examples) or will be AI dependent to fix them up and put a new layer on top. Discovering the right API to solve the problem is central to the dynamic logic agents introduce to workflows.
I've been building agents for both personal use and for automating internal processes within my team/across the company, and the DX has not felt all the foreign from typical development... an idea, a quick prototype, a tight inner loop for rapid feedback, then a graduation to a deployed asset. While not foreign, doesn't mean there isn't plenty of room for innovation. The DX is where we're really focused today, particularly with Flows.
[1] https://newsletter.specstory.com/p/getting-started-with-soft...