In my opinion, language is a tool which carries forward the cultural values across generations. If Language is given less importance, ultimately the cultural values diminish over time.

I basically hail from South India, and my mother tongue is Tamil. I went abroad to pursue my university education. It was sad to note that many friends of mine who where originally speakers of Tamil, couldn't converse well in Tamil just because their parents insisted from the early age to use English at all levels(even at home). Also they patronized the West more, by means of watching American Sitcoms, shows, movies etc. I could see them losing their cultural identity over time.