Powerwall would certainly help with storage, wouldn't it? And consumers have an incentive to buy Powerwall to decrease the amount of power they need to buy from the grid.
Right now it's mostly for conspicuous consumption and virtue signalling. Those of us number nerds are waiting for the tech to improve and the price to drop more. A move off toxic/flammable lithium tech would be good too.
Unlike that debacle, this might even make economic sense once you factor in the government rebates/sweetheart deals and the PR bonus. Alas, nobody gives me anything on the side for buying a powerwall.