Chicken, Meet Egg.
See Title ^
It is one of those cases where it's a good idea on paper, but in reality won't work unless there is 100% of the infrastructure in place and ready for the public, plus a mandated requirement by governments for car manufacturers to conform to the specification required for the battery swapping tech, and we all know how well that will go down. Each manufacturer will want their own spec, hell, you can't even swap the batteries on a leccy car as it is!
Not to mention, In Australia, the idea is practically useless outside a major metropolitan area, apart from the self-charge fallback which makes the idea no better than a built-in battery.