[parasubvert]

UML Statecharts are definitely an interesting model , being HFSMs, and thus modular/extensible. But I think there is a lot to be said about context and application - this kind of thing needs to have a revolutionary 'right place, right time' opportunity.

Kind of like Hypertext and Hypermedia, which languished as an academic pipe dream for decades with occasional commercial moments of brilliance (Hypercard), until Tim Berners Lee figured out the right mix.