But who's community?

Asked in a BBC interview if the adoption of Sharia law was necessary for community cohesion, Williams said: "It seems unavoidable.
http://news.yahoo.com/s/nm/20080207/wl_nm/religion_sharia_dc;_ylt=Auvblos3pDh7M8mO5AvpZkdm.3QA
http://news.bbc.co.uk/2/hi/uk_news/7232661.stm

England seems ready to throw in the towel, at what point after they adopt Sharia Law, will they be given the choice of "convert or die infidel"?