Chinese is much more important in the rest of Asian than it was 10 years ago because of tourism. English is still the best language to get a long with internationally, but things could change.
But I don't think Chinese will become a significant business language for the rest of the world since they, like Japanese companies were found to be, are mostly insular. Not a lot of foreigners work in Chinese companies, Chinese companies don't have a lot of international exposure, China doesn't allow for much (if any) non-Chinese immigration. The reason English became dominant is that America (and before that the UK) is much more globalized.
But I don't think Chinese will become a significant business language for the rest of the world since they, like Japanese companies were found to be, are mostly insular. Not a lot of foreigners work in Chinese companies, Chinese companies don't have a lot of international exposure, China doesn't allow for much (if any) non-Chinese immigration. The reason English became dominant is that America (and before that the UK) is much more globalized.