big differences here from silverlight...

1) no plug-in (assuming all browsers implement their optimizations)
2) promises of ~1/2 native performance
3) already runs everywhere
4) vendor neutral

regarding ea.. that's just bad business. the tech can still be used for "good". i was thinking more about lob applications for the enterprise. imagine all those existing, boring business apps built on .net that just push data around could now run happily in everyone's browser without a plugin? i'd buy into that. 

after reading a bit more, it looks like gc is a challenge so you can't quite compile to asm.js directly from c# just yet.