I agree that messaging is a hugely important aspect for the future of Facebook, but I wouldn't say that FB's entire future is dependent on messaging. The article's title, with its use of "entrusted its future" seems to imply more than what's really at stake.
I would argue that virtual reality (with Oculus) or even the core social network base product is more important to facebook's future than messaging. Sure messaging is important, but it's becoming more and more of a commodity.
At the end of the day, I think facebook has currently entrusted its future to Zuckerberg and not the CEO of PayPal.