I can't imagine Facebook getting even 10% of their investment on Whatsapp back. It's crazy that they blew so much money on something which hasn't proven to be anything more than a flavor-of-the-day platform. Whatsapp suffers from the same flaw that made Facebook start losing customers to it in the first place: there was a paradigm shift in what the customers wanted in their social apps, and FB always was a touch too complicated for mostly-mobile users' needs. And just like that, the strongest player in the social industry started to decline.

There is zero guarantee that there won't be another such paradigm shift in the near (even super-near) future that would displace Whatsapp overnight. And unlike Facebook, which has tons of features (too many, yes, but that makes it unlikely that someone can replace Facebook with any single solution, which drastically slows down people jumping platforms), they're a one-trick pony banking everything on being SMS, only better. The second something happens and this stops being such a big deal to their users, Whatsapp loses everything. They have no means to ensure long-term user loyalty, they have no other value proposition, they're not ahead of the curve in any other relevant way. If (or rather, when) the Whatsapp bubble pops, FB is left with nothing.