Micron has said they're not scaling up production. Presumably they're afraid of being left holding the bag when the bubble does pop
DRAM manufacturers got burned multiple times in the past scaling up production during a price bubble, and it appears they've learned their lesson (to the detriment of the rest of us).
The 2027 timeline for the fab is when DDR6 is due to hit market.
>help ensure U.S. leadership in memory development and manufacturing, underpinning a national supply chain and R&D ecosystem.
It's more political than supply based
But yeah even if that's true I don't know why they wouldn't hedge their bets a bit.