One of the main reasons why multiculturalism is so important is that it teaches us to be tolerant towards others. What is more, being able to perceive all people the way they are and treat them equally is what we should be teaching our children right now in case we want to live in a more developed society in the near future.
The idea is that children will be able to view the notions of multiculturalism as normal ones and not as something which they should teach someone to understand. In other words, it will finally become the norm to be who you want to be and to feel comfortable being that person.
We all come from different backgrounds and we should be able to appreciate that as we have a lot to learn from some other ethnicities. In such a way, sharing those experiences will become a great cultural exchange which will help us create something totally unique. The more open-minded our society is, the more likely we are going to achieve greater things during our lifetime.