Not just their usefulness, but LLMs themselves are worse than an illusion, they are illusions that people often believe in unquestioningly - perhaps are being forced to believe in unquestionably (because of mandates, or short term time pressures as kind of race to the bottom).

When the ROI in training the next model is realised to be zero or even negative, then yes the money will run out. Existing models will soldier on for a while as (bankrupt) operators attempt to squeeze out the last few cents/pennies, but they will become more and more out of date, and so the 'age of LLMs' will draw to a close.

I confess my skeptic-addled brain initially (in hope?) misread the title of the post as 'Reflections on the end of LLMs in 2025'. Maybe we'll get that for 2026!