Samsung has released a new video in support of Google’s #GetTheMessage campaign which calls for Apple to adopt RCS or “Rich Communication Services,” the cross-platform protocol pitched as a successor to SMS that adopts many of the features found in modern messaging apps… like Apple’s own iMessage.
It’s not necessary to convince everyone to switch. Even one person switching from SMS to an internet-based chat app means a better chat experience with that person.
I’ve had multiple apps to be able to talk to everyone I know since about 1998, so I find the strong resistance you’re describing bizarre. I have encountered it a few times though.