As a web dev, the most exciting development I see is the rise of progressive web apps and a shift away from native apps in situations where web-like experince is more appropriate.
That said, I'll be thrilled if React Native gives rise to higher quality apps in situations where a native app is unavoidable (e.g. my bank's app).
I'm actually hard-pressed to think of any non-gaming interface that is better suited by a native app than a web app in 2017.
Five years ago native apps made a level of UX possible that was unheard of on the web, to say nothing of mobile. But today not only has HTML/js closed the gap, but whiz-bang native animations aren't impressive just on account of being novel anymore.
That said, I'll be thrilled if React Native gives rise to higher quality apps in situations where a native app is unavoidable (e.g. my bank's app).