Remember when Coca-Cola changed the recipe for Coke?  This is the same story for Microsoft.  Microsoft, Sinofsky, and Balmer will go down as the recipe changers who screwed over a happy development community.  

You cannot give developers a nice technology and take it away and then expect them to flop over to HTML5/Javascript.   Someone else will fill this gap and if it is not Microsoft then they will start hurting.  Maybe Microsoft becomes the next Kodak where it thinks its king and film will last forever.