Power requirements will drop too.
As well, as people adopt, the output of training costs will be averaged over an ever increasing market of licensing sales.
Looking at the cost today, and sales today in a massively, rapidly expanding market, is not how to assess costs tomorrow.
I will say one thing, those that need gpt to code will be the first to go. Becoming a click-click, just passing on chatgpt output, will relegate those people to minimum wage.
We already have some of this sort, those that cannot write a loop in their primary coding language without stackoverflow, or those that need an IDE to fill in correct function usage.
Those who code in vi, while reading manpages need not worry.