I don't believe that the people who need power most are the last to get batteries, because typically richer households use up more energy due to them being able to afford the most appliances, luxuries, etc. Therefore they would also be likely to use home batteries as it will be the most viable option for them both economically and practically. However, because markets would want to cater to these people, tech industries would likely prioritise on focusing on technlogy the rich people would pay for. This money invested into innovating home batteries would likely trickle down to other variations of home batteries that would be more accessible to the middle class, and they are the largest portion of consumers. Therefore, home batteries will be the future of the electric grid because in the future, they will be a lot more cost-efficient and easy to use.