I think you fail to understand the concept of the 'nation-state' in general, and in particular within the context of the United Kingdom.

The United Kingdom is not a nation-state but rather a state of nations, 5 to be precise, the English, Scots, Welsh, Northern Irish, and the Cornish.

If anything, Scotland voting for independence is the embrace of the nation-state in its purest form, a state for the nation of Scots, which is of course the aim of people espousing a 19th Century concept of nationalism.