The fact that there are many networks is not, by itself, the problem. It's a fun thing to joke about, but not truly bad.
The truly bad thing is that as of March 2017 there is not one network that is secure, reliable, and popular.
Non-free-software networks WhatsApp, Kik, Allo, Facebook, Line, KakaoTalk, WeChat, etc., are not secure by definition. I don't trust a word of what WhatsApp is saying about Signal-protocol security. It's not just about my safety from government surveillance—I am even more concerned about processing of my data by marketing companies who want to learn who I am to improve their sales (or political campaigns—it's quite the same thing).
Signal is Free software, and it's widely recognized as secure, but it's not reliable because many people complain that messages are delivered slowly or not at all, and it's not popular. Also, it doesn't have much of a bot API, and it's becoming important these days. Finally, its partnership with WhatsApp is truly puzzling.
Telegram is partly, but not completely, Free software, and it's more reliable and popular than Signal, but not very much so. Personally, I love it for the features, like channels, groups, bot API, and cloud storage, but I acknowledge it has problems. (Most of my friends are on WhatsApp, and those of them who tried Telegram all said that Telegram's features are better.)
Wire is kind-of curious, but very unpopular.
What I really wish is that Mozilla stopped all its activities except developing Firefox on desktop and Android (I'm talking about pointless stuff like the recent rebranding, Webmaker, overblown international conferences, etc.), and then acquired Telegram or Signal and focused all of its non-Firefox efforts on one of them. If it acquires Telegram, it should make it fully Free software. If it acquires Signal, it should invest in its reliability and popularity.