If we are, indeed, in a virtuous cycle of LLMs building on each other, then we are actually in the knee of the curve before exponential increase in LLM capability.
An LLM that can access all other AI models (e.g., HuggingGPT) is not limited to the strengths and weaknesses of any one model. Declarations of "Peak LLM" or "LLMs can never be secured" are as laughable as statements like "Assembly can never be surpassed in abstraction".