So will Spain just wave goodbye and let them go peacefully or will them send in their version of General Sherman to slash and burn his way to the sea and crush those rascally rebels once and for all? Taking bets....
Spain would go bankrupt faster without Catalonia.
If Madrid is really determined to put down a Catalonian rebellion, they’ll just send in the hated Guardia Civil with their bicorn hats.
Guardia Civil makes the Italian Carabinieri look like boy scouts. Franco used them to hold Spain together after 1939.
Francisco Franco opted for the Sherman approach whenever Basques and Catalans made noises about independence. The most today's Spanish government would do is simply refuse to recognize them and try to deny Catalonia membership in the EU (which for some stupid reason is a very high priority for alleged advocates of independence - they're swapping Madrid for Brussels).