I think to answer this question, it depends largely on which industry the child is looking to enter in future. Some jobs require more personal touches and interactions with others. Some requires presentations to clients and colleagues.
Nonetheless, there are many benefits associated with learning to speaking in front of an audience/crowd. The ability to express one’s ideas and opinions not only builds confidence but also makes one more credible. If we are looking to lead and influence others from managerial roles, we must learn to speak and communicate in front of a group, be it big or small.
So, if you child is afraid of speaking up in front of others, it would be good to cultivate it from young! It will only bring about benefits and a easy path when he/she pursues higher education and enter the workforce.