Embedding in other applications seems useful - imagine using it as a general plugin system. It's a bit strange that security and sandboxing aren't mentioned; that seems like WASM's primary value proposition here.
Those plugins still need an API in some language to interface with the host. A natural choice would be JavaScript: it's the world's most popular programming language, relatively easy to embed, and runtimes are available in every operating system.
At that point, you don't need WASM separately — just execute JavaScript and allow plugin writers to embed WASM modules for high performance, just like browsers do.
Well, if you were doing that, I don't think you'd need wasmer. V8 alone would be enough. Wasmer seems like an attempt to get away from Javascript and interface more directly with WASM.
