I think someone in a chatroom I'm in is working on something like this; embed a WASM runtime in a fat ELF (or PE) that will also load a runtime from disk if it's newer and then compile/JIT the included WASM code.

IMO WASM can probably learn from the JVM mistakes a lot, especially when the runtime gets baked in so you don't need it on your computer just to run it (looking hard at you JVM, don't try to hide!)