I doubt anyone knows what the impact will be, all we can do is speculate. In the very short-term, I would definitely be surprised if we don't see it have a negative impact on the development of Rust and certain Rust projects such as wasmtime. In particular because so many of the top contributors appear to be full-time Mozilla employees[1].

1 - https://github.com/bytecodealliance/wasmtime/graphs/contribu...