A mí también, obviando los comentarios como los de >>11, no he visto muchos argumentos en contra. Encontré esta lista de ventajas sobre incluir Rust por ahí:

-No undefined behavior in the safe subset (when unsafe code is sound), including memory safety and the absence of data races.
-Stricter type system for further reduction of logic errors.
-A clear distinction between safe and 'unsafe' code.
-Featureful language: sum types, pattern matching, generics, RAII, lifetimes, shared & exclusive references, modules & visibility, powerful hygienic and procedural macros...
-Extensive freestanding standard library: vocabulary types such as 'Result' and 'Option', iterators, formatting, pinning, checked/saturating/wrapping integer arithmetic, etc.
-Integrated out of the box tooling: documentation generator, formatter and linter all based on the compiler itself.