You might find that the EU isn’t happy about referendums or the idea of fifty-odd members (if more and more independence movements started up). I think at last count....there are at least twenty break-up movements underway in Europe.
I'm not sure I agree with you. One of the main reason they want their independence from Spain is an economic one to begin with.
Why does Catalonia want independence from Spain?
The economic crisis in Spain has only served to magnify calls for Catalan independence as the wealthy Barcelona region is seen as propping up the poorer rest of Spain.