The lack of devs that understand the domain knowledge and the codebase will be the main issue.

I would say that the current capabilities of genAI is like a junior dev, sometimes even a mid-level. But one main difference is that a dev is slowly learning and improving and at some point will become a senior dev and also domain specialist.

If there is a codebase created by genAI, then it’s equivalent as if all devs left the company, so no one knows why some piece of code was created in a certain way, if it was part of the business logic or some implementation detail