Muslims will become a dominant force in Western Europe. So you may see kingdoms like Catalonia emerge. Maybe that will be necessary to fight the Moors of the 21st Century.
Honestly, Barcelona is just about the least likely Spanish city to take on the Moors of the 20th century. I was just there a few months ago. It’s a beautiful city in places with a great history, but to a large extent it’s like the San Francisco of Spain, with the liberal/left safely in control and complete with bums smoking weed on the street.