I haven't painted anyone out, just said that in my day to day life and business the history is irrelevant, as it is to the whole of the rest of the country for almost all their lives. Our history is like an occasional hobby interest for many and not even that for most who only recall it on rare occasions.
The tourists come here for the obvious, Buckingham Palace and changing of the guard, Parliament, Westminster Abbey, Stratford upon Avon and the like. But with the history obsession of a minority we preserve all manner of valueless buildings on any pretext, disfiguring the countryside and urban areas and preventing or distorting development in many instances.
I don't agree that it is a shame since international diversity is what has caused so much warfare and religiously inspired misery through the ages.
And as AK has observed, local diversity will still exist since it's in human nature to identify with the people and place around themselves. That's why the diverse peoples born of many races in London and New York identify as Londoners or New Yorkers and drift towards the local manners of speech and custom.
Hopefully eventually there will be one worldwide language, probably a form of English, and that will be the greatest advance the human race has ever made.
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