Although Peer-to-Peer SMS is being quickly replaced with messengers, Application-to-Person SMS market consistently grows by at least 4% annually and currently is estimated to be around $62.1 billion (ref: https://globenewswire.com/news-release/2017/05/23/995205/0/en/Global-A2P-SMS-Market-Size-Will-Reach-USD-70-0-Billion-by-2020.html)
A2P SMS is widely used among most top IT companies, such as Google, Facebook, Uber, to deliver one-time passwords, alerts, notifications etc. A2P SMS will be extremely hard to replace as it is practically the only way someone can verify that the phone number belongs to you and also to deliver important alerts to any existing mobile phone.