To the newest generations email is an antiquated technology that has no real use among their peers. Eventually they might get some email address for college/professional use, but that's practically akin to a fresh college grad now getting a fax machine because "its what we use at the office".
Not shocking.
Edit: Unless by "the scariest thing" you mean the idea of xyz@facebook.com becoming the default for the >17 crowd, in which case, disregard my nonsense.
I can see the business & college need for email but for friend to friend communication Facebook messaging is already dominant.
My wife's friends are the same way. Sure, lots of them have facebook accounts, but all of her friends and business contacts, new and old, email and gchat regularly. She doesn't even have a facebook account yet and has no intention of ever setting one up.
In fact, I feel less pressure to use facebook these days than I did a year or two ago. I don't even go on it anymore other than when I'm working on apps that use the graph api. My wall is filled with stuff I don't care about and if I want to contact someone I email, chat or text them.
A lot of users though seem to have made Facebook their web world and are willing to accept a crappier messaging system for the convenience.
And it's not early adopters making the switch. I've been using FB for well over 6 years, but I still prefer to send an email over an fb message. Most of my friends are the same.
That's all I can thing of right now.
I'm pretty sure Asterisk can use a cellphone over Bluetooth.
99% of my personal mail - both email and physical mail - is either companies sending out notices (adverts, bills, whatever...) or websites I subscribe to telling me there's something I should see. Direct personal communication has very largely shifted off the platform.
Interestingly, that doesn't yet seem to be the case for corporate communication (into which I include somem voluntary work I do). I still send and receive plenty of email on that account, but this has me wondering for how much longer....
Today I have gotten emails: interview info from MS, an announcement as to why the University's power went out, payroll setup info for my Uni, tech advice from a startup friend, and an email from my TA about my lab today.
None of that would have been visible/accessible or possible to communicate to me through anything besides email.