Its a concept that they've proven can work by building a prototype. I imagine the logical next step would be to extend the concept by building a second prototyp

Its a concept that they've proven can work by building a prototype. I imagine the logical next step would be to extend the concept by building a second prototype that would do something better than this concept. As you can see they've limited themselves to building axis-symmetric structures to ensure the robot can drive unimpeded. A large proportion of existing buildings have rectangular shapes which these robots would also struggle to build. Its an experiment!