Language played a pivotal role in the ascendancy of humans over (other) animals. It enabled thoughts and ideas to be transferred from one generation to the next thus allowing successive generations to improvise and progress. Writing gave this a boost and the internet supercharged it.
Do you have any plans to integrate machine learning into your current organizational structure? Or are you just wanting to build up an intelligent and self-contained system to serve a certain user base? Whatever goal you have for machine learning implementation, text data collection or speech data collection you won’t be able to achieve it until you have appropriate data to work with.