On the other hand, using information from Facebook themselves (creators of React Native), the cross-platform solution seems to be able to scale pretty darn well [1]. Facebook, Instagram, Bloomberg, Skype, Walmart, Uber... these are some pretty big names with some pretty big audiences. If React Native can get your company from a startup to the size of any of these companies, I'd say you're doing pretty well on the technology front.
Kind of like how Twitter had to do a major rewrite from Rails, but Rails got them to the point where they needed that rewrite.