Luckily EV mandates have been rolled back nationally (although not in my state yet). That’s a sure way to drive up the cost of storage anyway, when maybe battery storage is better served for this power station purpose instead.

Obviously using used car batteries might be a way to recycle these more effectively than what is currently available.

It's going to have no effect on the global cost trajectory of battery storage. The US is not in the storage driver's seat, China is.