Sure, but there's no standard ABI for WebAssembly yet. I'm basically just saying we need an ABI before we can target it as a platform apart from the web.
It's not really a standalone platform, though. It's a sandbox utility to contain high-speed or highly customized computation, that can be plugged into any other platform. By design, it doesn't seem intended to be limited to a single higher-level (well, higher than assembly language) ABI.