Let's hope it's permanent.
Of all the big tech companies Facebook is the only one where it can completely disappear overnight and my life would be completely unaffected (or possibly improved by not having to explain to people I don't use facebook, please email or text me your invitations rather than use messenger). If Google, Amazon, Netflix, Apple disappeared the story would be completely different.
Messaging: people have been switching on hordes to every new free messaging system in the 90s and early 2000s, we will adapt to something else.
Netflix and video in general: same thing without the 90s/early 2000s.
Amazon: very convenient store, we'll spend a little less and somebody will fill the void.
Apple: can't say, never bought anything from them.
By the way, when I couldn't message on WA today I thought day they finally cut me off because I still didn't accept their new privacy policy from months ago :-) I resolved to wait and see for a couple of days.