It would make a LOT more sense to be pushing LifePo4 than more lithium ion powerwalls. Far better durability, less risk of runaway thermals, and the slightly lower power density is irrelevant for a static deployment.
1. 100m to achieve what?
2. There are only around 82m single family houses in the United States.
Many larger solar installs would have a 2nd or 3rd powerwall