What should English English look like?

In today's globalised world, English is the language of communication. This implies that you must be able to understand and be understood by other English speakers. What does this mean for diversity? According to the Massive Open and Online course (MOOC) English Pronunciation in a Global World, diversity in spoken English should be appreciated. There is no one correct way of speaking English. The focus should be on mutual understanding - not on loss of identity as a result of standardisation. However, the fact remains that people who speak English with an accent or make pronunciation 'errors' are ridiculed, belittled, and denied opportunities. Somehow, they become less than the rest of us! The next time someone speaks English differently than we do, or hesitantly, they should feel proud of the richness of their experience and culture, rather than be made to feel inferior.