> Prepare for the onslaught of new (and old) languages targeting the web.

"Prepare for"? As if that hasn't happened already, with virtually every modestly popular language having at least one web-use-oriented compile-to-JS transpiler, and several new languages being invented whose only implementation is such a transpiler.

WebAssembly makes the process easier, and may make it easier to maintain those along with the non-web implementations of the languages, but its a little late to prepare for the onslaught of web-targeting language implementation.