The weight is the most trivial problem to solve in this whole problem chain. A hydraulic lifting apparatus capable of moving a ton that fits under a passenger car is something that exists today.

Getting automakers to agree to a standardized form factor (and to not put non-battery components in their battery packs ala Tesla,) automatically locating and removing whatever retentioning mechanism is used, having a large enough stock of batteries at each “filling station”, etc. are more difficult problems.

But, as I said, I hope this does happen in the future.