This is my guess for the demand side: most people will drift away as the novelty wears off and they don't find it useful in their daily lives. It's more a "fading point" than a "breaking point."
From the investment/speculation side: something will go dramatically against the narrative. OpenAI's attempted "liquidity event" of an IPO looks like WeWork as investors get a look at the numbers, Oracle implodes in a mountain of debt, NVidia cuts back on vendor financing and some major public players (e.g. Coreweave) die in a fire. This one will be a "breaking point."