For me, the more apt analogy for this discussion is not imagining Carsland without the car denizens, but without the all the rockwork/mountains (e.g., you only experience Monument Valley inside a show-building).
My initial imagining for a Zootopia land would be something akin to this concept by Kevin Dang:
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I'm okay with idea of Zootopia land in SDL, but was a little disappointed the art only showed (and Brian makes it sound like the only pedestrian area will be) the city square cul-de-sac. Something like the above maybe too much to fit in a mini-land, but I can understand how the city center part of Zootopia is not as enticing as the movie's other realms (which will surely be part of the ride interior, via screen or set).
Hoping the ride is a successor to Splash Mountain (long, physical sets & AAs, thrills), versus the Mickey's Railway ride.