This is not what is happening. iMesage will stay as it is, RCS support is an add-on like SMS support always has. As RCS is a mobile standard (like MMS). And like MMS, if you stick within the limitations of SMS, an SMS will be send.

This is one of your articles where I get puzzled if you only ever rethink what you are writing or are just impulsive. You know, you are producing a lot of misinformation, don't you?

And why I am getting suggested to read your stuff as much as it happens?