I'd say yes, at least until we out grow the "UI as trees" paradigm that dominates pretty much all of modern UI development at the moment. I can see that potent

I'd say yes, at least until we out grow the "UI as trees" paradigm that dominates pretty much all of modern UI development at the moment. I can see that potentially changing if/when AR/VR takes off and we start building UIs that are 3D in nature, for instance, since the hierarchical structure of a tree no longer make any sense for objects in 3D space that have 6DOF. A-frame might offer some early insights in this area since it's attempting to bridge the gap between the 2D document model of the web and 3D interfaces of AR/VR.