> his biggest surprise was Go is mostly gaining developers from Python and Ruby, not C++
Why is that a surprise? I think it's logical, and Go can be expected to attract developers who are used to garbage collection (Java, Python, Ruby etc.). Not so much C++ developers who prefer to have control and choice (i.e. pay for what you choose, rather than get it handed down forcefully). Rust is a better candidate for attracting more C++ developers than those from Java, Python and Ruby background.
Why is that a surprise? I think it's logical, and Go can be expected to attract developers who are used to garbage collection (Java, Python, Ruby etc.). Not so much C++ developers who prefer to have control and choice (i.e. pay for what you choose, rather than get it handed down forcefully). Rust is a better candidate for attracting more C++ developers than those from Java, Python and Ruby background.