Some of us are already experiencing that. For example I handed off an initial version of something some months ago, and the AI-generated stuff they came up with was a huge buggy mess of spaghetti code neither of us understood. Months later we've detangled it, cutting it down to a third the size, making it far simpler to understand, and fixing several bugs in the process (one was even by accident, we'd made note of it, then later when we went to fix it, it was already fixed).