[vectorjohn]

Wow, so for the short time you have kids in diapers this won't work for you personally. Big whoop.

We still have typewriters around too, and some people ride horses. Old tech doesn't die, it just diminishes to a smaller niche.

[marchenko]

"Diapers" is just a synecdoche for parenting equipment: diapers, wipes, books, snacks for older kids, extra changes of clothing, etc.

Car seats will be a bigger problem: they are unwieldy, legally mandated, and require careful installation to be effective. Unlike diapers, even the small boosters used for older children can't fit in a shoulder bag.

A young couple expecting to have children in the next few years might balk at these inconveniences, and that could depress adoption of the 'mobility' model. You have to keep prospective purchasers in mind, who are evaluating their needs over the use-life of a car.