One of the main parts of culture is its language. When the language dies, the real culture dies; it lives on only in museums.
The Mongolian people will remain alive as distinct from other nationals as long as the Classical Mongolian language exists.
Computers are a big part of the world culture. This is where people are talking to each other today. If Classical Mongolian is not used in the world of computers: on websites, in operating systems, in technical language, then Mongolian culture won’t be part of that world.
Cyrillic is only used in Northern Mongolia. Most Southern Mongolians can not read Cyrillic. Using Cyrillic excludes two thirds of the Mongol population. Remember, there are twice as many Mongol speakers in China than in the Republic of Mongolia.