Java is still available at zero-cost
Honest question: How often do people upgrade their production language?<p>Me: once in a decade, maybe. I'm still perfectly happy (and productive) with C# 3.5, Java 7 and Python 2. I'm grudgingly moving forward because the old toolchains are being deprecated now, but my codes aren't significantly improved because of a few fancy idioms available in a new language, and it barely affects the design decisions. Upgrading your library or framework can be more often, but I tend to still be fairly conservative. Upgrading your language for production twice a year sounds crazy to me.