I feel like 90% of the problem with Labview is the interface, so I wouldn't discount interface improvements.

Even if this wasn't spaghetti code, most of the Labview icons are totally unreadable:

http://www.ni.com/cms/images/devzone/pub/nrjsxmfm91216399872...

Simulink and LabVIEW to DeepUI can be compared to what C is to Lisp.

Simulink and LabVIEW are made for electrical engineers transitioning to developers. They are good tools for building and shipping products.

DeepUI on the other hand introduces new paradigm for visual expression, and it looks to be more targeted towards computer scientists and experimental artists (and maybe hobby game developers with aversion to traditional programming).

I agree that in all these visual programming languages the interface is always way too slow. They tend to completely ignore the keyboard which is by far the fastest input device.