The Scottish referendum has a long history and the nationalist (SNP) campaign initially appeared to be a further step to gain more devolved powers, then it became "we want out of the UK".

Nationalist aspirations are found in a number of European nations, some appear to be a residual, occassionally violent threat; Corsica for example. Or a popular cause that steadily gains power, not independence like in Catalonia. Not so far away is the Basque cause, which has been harmed IMHO by ETA's terrorism, but remains a potent non-violent cause for many. The UK of course has Northern Ireland! Independence is currently parked as an aspiration by popular agreement, except for a few "die-hards".

In the UK and maybe in other, established West European democracies there appears to be an increasing disconnect between the electorate and those in politics and government. Here that is shown in a steady decline in local and national elections. Plus a drammatic fall in political party membership and in the last twenty years trade union membership.

So yes there is pressure building. Economics do not necessarily dominate the public debate, although for social welfare reasons the under-employed or unemployed appear content to stay at home playing games on the TV, drinking, taking drugs and more.