It is important to understand that most of the job of software development is not making the code work. That's the easy part.
There are two hard parts::
-Making code that is easy to understand, modify as necessary, and repair when problems are found.
-Interpreting what customers are asking for. Customers usually don't have the vocabulary and knowledge of the inside of a program that they would need to have to articulate exactly what they want.
In order for AI to replace programmers, customers will have to start accurately describing what they want the software to do, and AI will have to start making code that is easy for humans to read and modify.
This means that good programmers' jobs are generally safe from AI, and probably will be for a long time. Bad programmers and people who are around just to fill in boilerplates are probably not going to stick around, but the people who actually have skill in those tougher parts will be AOK.
What is a systems analyst?
I never worked in a big enough software team to have any distinction other than "works on code" and "does sales work".
The field I was in was all small places that were very specialized in what they worked on.
When I ran my own company, it was just me. I did everything that the company needed to take are of.