We can see from past examples that market share has big inertia. Even in cases where the top choice was under performing by a large margin it took years for maj

We can see from past examples that market share has big inertia. Even in cases where the top choice was under performing by a large margin it took years for majority of users to make the switch. Think about examples like Internet Explorer, Yahoo Mail, Windows on servers, etc. We can also see from those past experiences that at first a very small minority of - let's call them power users - made the switch when otherwise the underdog seemed hopeless. But from them the infection spread. I think power users are also "influencers" and are worth a lot more that one single normal user as far as market share goes. Now, functionally, WhatsApp is still good. So it's not clear if this will lead to anything. But something happened, there's no denying that.