Niro almost seems like the perfect starter vehicle for someone starting a family and the Tuscon suitable for average American 4-5 adults. Just from the visual posted above you can see how good headroom is.
That is after all how it's always been, examples of this are already on the road, and that's the biggest indicator... look at who bought and what they're doing with it. Fortunately the market is still in its infancy.
They will need to have that one model that serves multiple purposes and the Niro seems to be it, the Soul would be the next best thing but it's not anywhere near as 'universal' as the Niro. So chances are the Niro will get it.