desertgirl hasn't been back, Fillyjonk, because she has been at work, it isn't the weekend here.
I don't, personally, believe that stopping calling 'Paki shops' 'paki shops' has made a difference to how people think, and I am not sure how you would prove that it has. Which came first, the decrease in racism (which I would be inclined to attribute to other things, personally, such as more exposure to people of different races, increased education, etc) or the change in terminology? If terminology is all it takes, lets change some more terminology and it will all be gone, no?
I don't, in any case, think that the terms are comparable. Paki shop was never 'correct' - you wouldn't have read it in a (respectable) newspaper. The only similar ones I can think of (though there are probably others) are 'Ms' and some of the changed terminology for disabilities and disabled people. It is quite impressive how the disability terminology manages to change without apparently causing problems during the changeover, but am not sure that the different terms have changed attitudes there either - if you have any evidence that they have, I would be interested to see it (as I would with the racism one)
Ms, on the other hand, still involves making a 'statement' as is sadly apparent from this thread, what must be well over 20 years from its inception. I just struggle with the idea that adding 'Mesdames' which doesn't even sound like an English word is worth all that politicization (where using the old term will be making a statement, using the new term will be making a statement, neither statement will necessarily be one I want to make) for the next 20 years in respect of what is a very niche usage.
And if you really have to change it, couldn't you just change it to 'Dear Allen & Overy LLP' or 'Dear Freshfields' or whatever instead of adding the ridiculousness of Mesdames to the existing ridiculousness of Sirs?