It wasn't ML but gaming that drove the demand for GPUs, and ML sort of rode in the slipstream (same for crypto). Later demand for crypto hashing drove GPU sales as much as gaming but that is now over. So unless either (1) ML by itself can present a demand as large as either crypto or gaming or (2) Crypto or gaming can provide a similar demand as they've done in the past the economies of scale that drove this will likely not be reached again. If they do however the cost of compute will come down drastically and that in turn may well drive another round of advances in models for the larger players.