A car stuck in the middle of the motorway is dangerous. Dropping nails requires physical access and isn't scalable.

This would be devastating to Linux's reputation.

Let me just leave this here for you. http://www.youtube.com/watch?v=2jNUQaG3wzA

If you're wondering what flow-based programming feels like, I work on an open-source framework called FlowVR.
It is advertised towards high-performance computing but suits small applications just fine.