It is hard to judge about companies which are naturally sharing some anti-academic attitude, so it is more decent to analyze some information from FOSS movement. It quickly becomes noticeable that there are no such language as "C/C++" and one of my favorite writings in the field of C programming language is [1]. I believe most software of GNU movement keeps using C as their base language until something more persuading will be shipped and I consider both Rust and C++ as not that beautiful C replacements because of too much overhead.

For example, neither PL from three mentioned ones can not do templates which are not a PITA when dealing with more than one data type. IMO (inspired by Lisp of course) this feature is more important than RAII or borrowing which effectively works only with tree-shaped data structures.

[1] http://250bpm.com/blog:4