why bother with this language issue? this  is such a non-issue. chinese, japanese, korean, let them converse in whichever language they want. let Mr.Prachanda baby-talk, sweet-talk, daddy- talk or king kong talk with King G. as long as they agree on something which is good for Nepal and Nepalese, we are happy hoina? why are we so much after "hajur/tapai"? does it make any difference?there are million more other things  to be changed and reformed in our society.
language is an art, it speaks in itself, it's an expression, the degree of sophistication however differs in different layers. that does not mean it should be associated with certain caste, creed or class. if you appreciate this art, there is no harm in adopting it.