My father started using Skype the moment he got his iPad 2 3G in 2011, in order to talk to his brothers and sisters, who live in other cities.
"BUT HEY, he can use FaceTime!!!" ...
I wish it were that simple...
First, my father and technology don't get along very well...
Second, iPad 2 does not support FaceTime over 3G. And he has no "domestic" broadband access in his home.
Third, some of his relatives don't have Apple products.
Fourth, he refuses to get any sort of newer iPad, since his iPad 2 still does what he cares about.. and he prefers not to update, since he saw how newer iOS slowed down my very own iPad 2... it's still in 5.1.1..
Last, even after I gave him an iPhone SE for christmas last year, he refuses to get a decent plan for it, because iPad 2 is still there. So, he uses some sort of "pay as you go" cheap pre-paid that gives him a 30 MB allowance a day... and by that, the chance that he starts using FaceTime is .. well.. less then 0...
TL;DR
My old father still uses Skype, so I still have to use it...

But it sucks... and that new millennial version will probably make things worse..