The memory makers will not expand demand drastically. It is in the nature of their business to keep the market under-supplied, otherwise the following oversupply will kill them. Instead, supply is just rerouted from less profitable segments such as mobile and personal computing.
If the existing memory makers retains control of the market and don't defect from the optimal-long-term equilibrium for themselves, that's true. It just takes one player to defect for short term gains as we've seen with some past boom-and-bust cycles. Alternatively, it takes a sufficiently-resourced player with enough incentive to enter the market themselves (NVidia, Google, Amazon, the PRC government through one of many companies...)
Relevant article posted on HN about this a few days ago: https://davidoks.blog/p/ai-is-killing-the-cheap-smartphone
Reminds me of how Samsung is giving out $340,000 per person bonuses. Shows you how much of a stronghold they have in market.
Supply and demand always balance out. There is no way manufacturers aren’t going to compete away these inflated margins, as long as they feel like this demand is sustainable.
Apple could always decide to build their own fab or some such thing.
China is about to flood the market and prove this notion wrong. If there is demand they want to meet it with supply.
But to your point, that is exactly how American companies like to play now. No one is stopping them from screwing over the consumer.
I have a Micron near me and they are building another chip facility but we are years away still so I suspect China will beat them to the punch.