Upgrade to React 16
Doesn't seem like there is that much involved, but we would likely benefit if we wait a while, while the libs we depend on update.
This guide shows most of the work involved: https://blog.discordapp.com/lessons-from-migrating-a-large-codebase-to-react-16-e60e49102aa6 and there's even a code mod (jscodeshift) for some of it.