ZUIs are far too esoteric for the average WIMP paradigm nearly all computer users are familiar with. I wouldn't count on it anymore than I would on getting an Oberon/Cedar-like programmable text window interface.
Apple has been experimenting with zoomable UI a bit recently: the Apple Watch home screen is essentially a ZUI. On the iPhone, Photos and Calendar zoom as you progress through the levels of hierarchy (though you can't zoom interactively). Safari on the Mac and iPad also lets you zoom out to see your tabs in a ZUI-ish way.
ZUIs are far too esoteric for the average WIMP paradigm nearly all computer users are familiar with. I wouldn't count on it anymore than I would on getting an Oberon/Cedar-like programmable text window interface.