Should the Glee cast have more asian roles?

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I was just watching the open auditions for the third season of Glee that were put up on Youtube last year. The youtube phenomenon Sam Tsui was one of the thousands of people who auditioned. On the comments for his audition video, someone wrote that Glee would not be likely to cast another asian because there are already two major asian roles. Sadly, I understand the likelihood of this statement, because two asians is already a lot compared to the average television show in America. Heck, even one asian is a lot. The question is why should we feel that shows have to replicate the population of America? Are people really so unaccepting as to avoid watching shows that have minorities in them? How about things from the minority perspective? Us minorities have been watching the same tv shows all our lives- 95% caucasian. So now we have this one show that allows asians to view their own race and it's so liberating... at the same time it's a very small step.