Storage is time-shifting a lot of energy but it can't do long periods of time in large volumes - still a significant problem. What you are referring to is small incremental changes (like peak shaving or demand response programs in single hour increments). And it isn't only a co-ordination problem (which many companies are solving) its a physical/physics problem.

I am all for energy storage and solar - I've worked extensively in both. Their continued growth is a huge asset for humanity. That said they aren't a panacea and doesn't cover the full spectrum of energy needs even with continued cost reductions - they have constraints due to the physical reality of the world and how power is produced.