Comparing current LLMs to the ENIAC is thought-provoking; I understand the eagerness to extrapolate in that direction. That being said, I don't think it will be linear or even logarithmic in progress. The current state of computing and technological advancement has become:
Initial introduction or release
Major hype and influx of greed money. <- we are here
Failure to live up to the hype, resulting in the tech becoming a punchline and gobs of money lost
Renaissance of the tech as its true potential is eventually realized, which doesn't match the original hype but ends up very useful
Iteration and improvement with no clear "done" or "achieved" milestone, it just becomes part of society