I have never heard either verse sung or would ever expect to, and I have certainly never heard anyone recite them except in arguement such as yours. Neither is relevant to our world today. However, the sentiments expressed with such appetite in "Flower of Scotland" do still seem to be relevant to many Scots.
Were the English to vote for the inclusion of the above verses to be sung by our national teams etc, I think you would be able to argue your case.