There's a lot of people here claiming that their personal use is representative of their country, or of Europe as a whole. I get SMS from a lot of people. You don't, probably because a lot of the people you know are on Facebook/Whatsapp and it's more convenient for them to stay with that platform. That doesn't mean that they don't use SMS for anyone else. It just means that you are bubbled.
The stats show a significant drop as mobile data became cheaper and richer services became available, but still quite a lot of traffic.
I suspect that the people I see using Nokia and Samsung dumb phones will continue to use SMS, so traffic will fall to a sustained tail.
https://www.statista.com/statistics/271561/number-of-sent-sm...
WhatsApp is a closed protocol owned by Facebook. It has its uses but relying on it is a mistake.
https://www.statista.com/statistics/271561/number-of-sent-sm...