I don't see why a wasm blob would be any more palatable to maintainers than an executable.
Regardless, it was worth mentioning as a potential option. I am one of the handful of maintainers for an experimental distribution where packages are either compiled or interpreted from tarballs and this would be something we'd consider. I'd MUCH rather have the GCC front-end option, however. So far, we've simply not packaged Rust and have accepted that as dead-ending our Firefox package. This may potentially revive it.