As a European I'd love to see Universal open up shop in the EU...but.
They will financially fail just like Disney does in France. It's simple, we at least have 6 weeks of vacation, then there are the weekend breaks, going to London, Amsterdam, Berlin, Viana, Rome or Paris, you know the little fun thingies, and your 2000 euro budget (for your family) needs to go very, very far. So souvenirs will be bought by maybe 15% of the visitors (did you ever see anyone with an Efteling t-shirt?). Food shouldn't be too expensive or we walk back to our car and eat out of our trunk and the hotel or camping site should be as cheap as possible.
Who are going to Spain?
Young people with a very limited budget.
What are they doing there?
Partying, boozing and the other thing that gives you a free souvenir in the form of a STD, and that is it.
Then there is the language thing that make running a park is even more complicated than the US. Above that the EU has a ton of stunning theme parks like Europa Park, Puy Du Fou, Efteling, Phantasialand, Toverland, Tivoli Gardens, Parc Astérix, Gardaland, Alton Towers, Futuroscope to name a few.
So yes I love to see them build a quality copy of their theme parks but I don't think it will make financially sense unfortunately.