Welcome mats, intensification and multi-lingual signage.
I found this article on non-English signage interesting, although disputable.
Overall I disagree, and feel the author is being overly reactionary. There is a comment in the thread after comparing the contemporary complaints with those of 'too many brown faces' in the 70s, which I felt was very appropo. However, from an social and urban design perspective, I do think he has (buried in the mire) a sole good point.
This is the concern that as more individuals of a specific culture gravitate to an area, partly because of local shops that cater to them, and partly because of neighbours who speak like them, dress like them and think like them, you get more shops catering to them. So far, so what? Sounds good. Until you get a critical mass - as the blogger at Tumeke! called it - at which point other cultures may feel excluded and move away, the specific culture that now inhabits that area doesn't have to go elsewhere, and the integration we all consider to be so important, so crucial, doesn't happen. In other words: you get ghettoisation.
With the drive towards intensification, we want to push the local high street as a work location, a hangout, & a shopping destination. This isn't going to work if people can't read the signs. They'll move somewhere where they can. Or stay living there, and work, shop & play elsewhere. So the threatened cultural ghettoisation is potentially a problem for intensification.
How do we get around this?
Work with the shop owners to help them understand the importance of bilingual (or even multilingual) signage. I don't buy into this notion that the lack of English signage is deliberately exclusionary in intent, I think it's partly a lack of awareness that non-Chinese/Malaysian/Korean/etc people are interested in what they have to sell, and partly a forgetfulness that others can't read it - just like English speakers assume everyone else on the planet speaks, or at least should speak, English.
Institute a cultural awareness programme in the media, to help non-Chinese/Malaysian/Korean/etc speakers feel comfortable with the languages and products, thereby reducing the sense of otherness, or alienness. Many of the middle-class liberals so disparagingly spoken of in the Tumeke! article are comfortable with the signage due to a sense of familiarity, whether it is from cuisine travel, reading or social interactions.
Lastly, but certainly not least, consider why these immigrants feel the need/desire to move into an area where they are surrounded by those 'like them'. What does this say about our own welcome mat?