I wouldn't bet on that. I would expect C++ programs to have been written ages ago and not having been rewritten because of a combination of "it works"/"I can't

I wouldn't bet on that. I would expect C++ programs to have been written ages ago and not having been rewritten because of a combination of "it works"/"I can't read it"/"It's not my code". The most famous C++ to Go port must be dl.google.com (http://talks.golang.org/2013/oscon-dl.slide#1 http://talks.golang.org/2013/oscon-dl.slide#1), which arguably never needed to be written in C++ in the first place, except it was probably the only reasonable choice at the time. In other words: legacy.