Yah! No doubt they will end as 'happy' as in Cuba and in Venezuela with your approach! Catalonians were told by their former 'president' Artur Mas a couple of years ago that not even one bank would leave Catalonia in case of declaring independence. Well, the major banks have already moved their headquarters to other provinces and so have done over 1300 other major companies! 
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https://youtu.be/lJhXRCdR1eY
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Tourism is down, sales are down, suppliers to Catalonian companies are already demanding payment upon delivery of goods and services.... Yep, at that pace the separatists will no doubt end creating another "successful" Bolivarian republic in Catalonia. But fear not, that ain't gonna happen. Catalan voters will soon wipe out those snake oil salesmen from the political arena. Stay tuned for developments.