English as dominant language of instruction?

There has been considerable debate in international higher education circles about what language should be used for instruction. A paper delivered by Russell Kaschula of Rhodes University in South Africa at the "Going Global" conference raised questions about whether English should be the primary or dominant language. The relationship between local/regional language preservation and pride in one's culture is very important. Perhaps bilingual and multilingual programs will allow for English to be the connector while many languages contribute to protecting the uniqueness and value of many cultures.