Batteries are probably approaching their limit. I doubt that another factor of 2 reduction in size/power is possible. Super capacitors seem to have stalled out (probably on fabrication problems). I haven't heard anything about hydrogen storage in zeolites for a decade (of course I haven't been looking). Wireless power transmission pretty much needs to be point-to-point, or there's no way to bill for it.
OTOH, we really need a good power store that doesn't release carbon dioxide. All I've been able to think of is battery swapping, with the battery essentially being owned by the government. So standardized connections across multiple companies, and no problems with which battery is in the car. But that needs a reliable charge-meter. (I think fast charging is destructive of batteries, and even if not it poses huge problems to the power grid.)