Language and Guru

Regarding our Guru Granth Sahib:

Many say that it is imperative that we learn Gurmukhi, and ONLY Gurmukhi for understanding Gurbani. While it may be true that the essence of what our Guru said is best understood in Gurmukhi, it is important to consider the meaning of language.

Look at the spread of Christianity for example. I hardly see anyone fluently conversing in Latin, but rather English, Spanish, French, Russian, Chinese, ...

The Gurus went from place to place preaching in the language of the place they went. Our Gurus not only wrote in Punjabi, but Sanskrit, Persian, and others. In that respect, as our 11th Guru, wouldn't Guru Granth Sahib also preach to us in the language that the people of the place speak?

Just a thought.