Bill Gates stated that the Bitcoin is the future and that it is better than currency. Would you assume that his statement (as one of the many reasons) added value on Bitcoin which made it stronger and more stable in the system? 
I think it is true in part. Our world is growing, technology is the direction everyone needs, so bitcoin can be a common currency in the future.
Bill Gates is a people who have a vision for the better future of the world , and he have seen Bitcoin as a technological development ..