A clear majority of utility storage will not be batteries, just because cheaper methods will be favored.
The cheapest will rely on E = Fx, where F is air pressure, or gravity, or buoyancy. But liquified anhydrous ammonia, despite being more costly to make, will be extremely popular because it is easy to transport and store, and is fantastically useful for many purposes.
I think that depends on battery tech. If they get magnesium air or metal free organic flow working I would imagine it would probably be chosen over mechanical methods.
Ideally I suspect you don't really want utility storage anyway, you want something so cheap, small, and renewable you can do point of load storage and have a bit of grid independence, and not need as much transmission infrastructure.
The cheapest will rely on E = Fx, where F is air pressure, or gravity, or buoyancy. But liquified anhydrous ammonia, despite being more costly to make, will be extremely popular because it is easy to transport and store, and is fantastically useful for many purposes.