There doesn't need to be a single AI to create the entire app. An AI to model data structure, an AI to build an interface, an AI to consume external APIs, etc. We already mostly bolt libraries together to make software; it doesn't take a huge leap for those libraries to be generated by machine learning.
Building anything but the most complex apps will be trivial in 10 or 20 years time.
Ever try to build a web application in Assembly language or C? It would probably be pretty difficult. You don't have to do that anymore.
1 web developer can do more work today than 100 assembly developers could, from 50 years ago.
"The last people to be replaced are going to be software devs"
If your job is to write code so people can look at data and make decisions based on that data, you're gonna be the second to go.