[Lichtso]

I think the main issue with most general purpose visual programming languages is, that they are still languages. So they are modeled in a way that resembles a text representation and can often be mapped to a sequence of symbols (a language). However, there are far less tools if you leave the explicit text representation (things like compatible editors, version control, etc.) so it comes down to being an over-the-top syntax highlighting at the expense of the before mentioned other tools. So, I think that visual programming would only become a viable alternative if it were to let go of the ideas of textual programming (language based) and become fully graph based.