I am agree that both the parties should completly involved. If we are talking here about the Indic langauges then i understand why the native langauge is so important . There are lot of things involved in this emotions,feelings,way of communicating,easier to understand.
There are options in the mobile phones that we can do SMS by choosing our own language ....but its difficult to write so one should better stick to english or else if there can be an option where once can write in Hindi and English and that can be converted in some other language.