IMO, the solution isn't storage. It's ways to use cheap energy. As solar energy becomes an increasingly large part of the grid, there are huge incentives to re-structure electricity demand around when solar is producing heavily. One possible way this plays out is that we start doing things like water desalinization to produce fresh water, and electrolysis to produce hydrogen during the day when electricity is free, and getting heavy energy industry like aluminum smelting to shut off in periods where demand is higher. Some amount of grid storage will be necessary, but I'm guessing a lot of the solution will be shifting demand rather than supply, since it's a lot easier to turn off machines than to store enough electricity to keep them on.

Two sides of the same coin, I'd say.

The claims were being made that net metering currently has a set of issues that makes the referenced policy a generous policy. The link provides seems plenty to refute that claim to me. You seem to be moving the goals posts here.

If you combine net metering with time based pricing, it seems like there is plenty of incentive for smart people like you to build energy storage and make money off of arbitrage.

There is, but storage isn't cheap enough yet. Tesla powerwalls are still pretty expensive, at around $8k each, from what I hear. If they can get the cost down by another factor of 5-10, I think you'll see a huge acceleration in adoption and possible arbitrage.