Is this what Chris Granger's Eve programming language should have been?
I believe in the power of good reactive programming as Excel is amazing, and this Power-FX is looking really cool. I'd be concerned about how it fits within the larger engineering world versus the Microsoft universe, but I built a programming language that is reactive from the get-go.
And yes, it's in the context of board games, but I hope it can become more general in the future. Reactive just makes things so... easy: http://www.adama-lang.org/docs/reference-reactive-formulas