AOG
You wrote:
"If we go down this track, will there will come a time when they have to introduce Chinese, Arabs, (or any other distinguishable race), cross dressers, Atheist, Catholic, Jew, Muslim etc etc. all in the name of equality or whatever."
What's the problem with that? As long as they have strong storylines, i suspect that most people wouldn't care a hoot.
Just like people enjoyed the film Notting Hill, which is set in a culturally diverse urban area...the film was a massive success despite the screen being absent of anyone but white people.
The big soaps are set in urban areas, and they reflect the cultural mix that you see in real life.
If you wish to watch exclusively white shows, you could always stick with Midsomer Murders, Marple and reruns of Last Of The Summer Wine and Poirot.
I would add that there's a black character on Downton, so that might be out of the running for you - but you could always close your eyes, stick your fingers in your ears and hum 'Land of Hope and a Glory' when his scenes are on...