Over time, will less skilled programmers produce more critical code? I think so. At some point a jet will fall out of the sky because the coding assistant wasn't correct and the whole profession will have a black eye.
The programmers will be less skilled because the (up until recently) lack of coding assistants provides a more rigorous and thorough training environment. With coding assistants the profession will be less intellectually selective because a wider range of people can do it. I don't think this is good given how critical some code is.
There is another related issue. Studies have shown that use of google maps has resulted in a deterioration of people's ability to navigate. Human mapping and navigation ability needs training which it doesn't get when google maps are used. This sort of thing will be an issue with coding.