Rust can call and be called by C code without a translation layer. To me, this is a requirement for any language that is truly going to replace them. Also, Go went down the GC path which limits its applications to those where you can have unpredictable pauses and for me firmly places it in the Java/C# part of the spectrum.
I'm not attempting to advocate Go here (they're both fantastic options), but any application running on a non real-time OS can have unpredictable pauses. That's the world of preemptive multitasking. Of course this is a scale thing (Go doesn't escape those OS pauses), but Go 1.8's own pauses are in the sub-millisecond range.
C# and Java have pauses in the hundreds of millisecond range (though there are "real-time" JVMs that greatly improve this). And it's notable that Go goes to lengths to avoid generating garbage.
