There are two opposite answers here, and I feel like I could argue either one:
1) Humans were never held accountable, really
Outside of a few regulated industries, the worst that happens to an engineer who pushes negligent code is that they get fired. But after that happens, what actually changes? The organizational structure of the company that allowed the employee to push bad code still exists.
2) Humans will still be held accountable
If a human (managing a fleet of AI agents, let's say) ends up deploying bad code to production, they won't be able to point to the AI agent and say "it was them that did it!" -- it will still be the human at the end of the line that is held responsible.
