[pron]

The same developers who would be willing to try Go would also gladly use new Java libraries, and they will be able to preserve much of their hard-earned expertise.

You're implying that the mere switch -- all things being equal -- has an inherent advantage, while I say the opposite: all things being equal, switching languages is always a net loss, other than a possible advantage in recruiting in some regions where HN is popular. Of course, all things are never equal, so there are many other considerations.