Storage is definitely a technology, but if you're talking about something ready in the quiver to help us with getting to net zero in the near future, storage technology on the scale we are talking about, which is providing energy to a country-sized population—not just a First World country but all the countries on the planet that are trying to get to the same level of health and prosperity that Canada has been used to—that's an awful lot of stuff. It can't just be this or that, and you can't just throw one technology off the table because you happen to think it's going to take 30 years to get economies of scale down to where it's practical.
Unless there is a moral reason not to be doing it, if it's something that's technically solvable then we need to keep all the tools in the chest.