The web is hardly usable anymore. Even the simplest web sites are slow as molasses, thanks to heaps of "active" content alongside the actual information. Now you're going to bestow your own runtime on us? Now that we've finally ditched Java and Flash?
WebAssembly has all four of the key players involved (Mozilla, Google, Apple, Microsoft). Maybe, just maybe, we'll be able to write code in a language that suits the task and have it run fast in any browser. I'm crossing my fingers but definitely not holding my breath