You need to learn from the mistakes of the past. Urs Holzle at Google knows more about these systems (he did Self) than most, yet he's not advocating their use either. And certainly Google has the resources to try.

The problem with Smalltalk and Lisp IDEs was no one was using those languages. The other problem is that it didn't help that much when writing code. It helped a lot to navigate and learn a new code base, but after that you just want to stare at text. That's why SLIME is the preferred IDE for Lisp today.

Visual Studio is making steady incremental progress with visual programming. Their Workflow graphical environment is useful for building flowcharts and state machines. Their DB viewers can help construct SQL queries. And GUI builders are visual programming environments. You get help whenever you write a method, it shows all the method signatures, etc. VS and IBM's Rational IDE generates code from UML models. You have a special environment for creating unit tests. I haven't used Eclipse, but they must do many of these things too.

So only some of the Emacs and Vim guys are pining for visual programming. Everyone else is using an adequate tool already.