Given that the said language, Rust, has its own unique selling proposition, I think that's a good enough selling point for the project. Using Rust eliminates some specific types of bugs, and perhaps some users would be willing to adopt this project for those those guarantees alone.

At least CrosVM is interested in those guarantees. From the project's frontpage [1].

> What makes crosvm unique is a focus on safety within the programming language and a sandbox around the virtual devices to protect the kernel from attack in case of an exploit in the devices.

[1]: https://chromium.googlesource.com/chromiumos/platform/crosvm...