The answer lies in your question. I foresee consolidation in programming languages and frameworks with compact and well known ones edging out esoteric and niche ones. In a couple of years of time, I predict that there will be new languages specifically targeting LLMs that aren't as human readable but extremely compact similar to byte code (compactness is preferred due to context size limitation not fully going away).

So in a nutshell I feel like most things will be LLM generated with human focus mostly around systems boundary stitching with focus on extreme cases like quant and medical domains where human oversight might be needed.