Since 1987 I have taught people to use computers in schools. I have a PhD in instructional technology and taught graduate courses about technology to teachers for close to a decade. Not many of those people know about–or want to know about–flow charts. I think that those people are in the majority in most Discourse communities. That’s waht makes me consider “people” might not.
And as someone who has more than once been misguided enough to try to teach Normal People how to use LaTeX, it’s really hard for me to imagine those people willing to learn to use a text-based tool that builds flow charts. It would be cool as hell if you could, though. 
If you want to see what’s involved in developing a plugin, check out this beginners’s guide.