I have read through the thread and some comments from Spain
This matter has been going on in Spain for years. A majority of people in Catalonia and the basques don't want independence. Politicians toy with the idea to get more money from the central government and the central government, in fear, always gives out more. Always a question of money and in Spain independence it is not an issue people on the street are demanding on a day to day basis (unless you are a politician). Both regions have control over everything except foreign relations and the army.
The last time a basque president requested independence seriously he was promptly kicked out by his own party members. Catalonia is an economic mess with an extremely corrupt local political system. Catalonia was Spain's richest region when Franco ruled. Since they gained the current semi-federal status in 1976, they have been surpassed by the Balearics, Madrid, Basques and Rioja, which is not a very good sign of how local politicians have managed so far. Why would they do better if completely independent?
About the EU matter, the biggest problem is that when asked, the Catalonian politicans were openly saying that they would remain part of the EU. They even maintained that FC Barcelona would still play in the Spanish football league. Nobody wants to face the hard facts about the cost of becoming independent. It's very expensive, especially if you are a small economy which sells 50% of what it produces to Spain.