Knowledge of Spanish in Catalonia is not by any metric bad.
A quick Google suggest it has a) more native speakers than English, b) more total speakers than English, with only Chinese ahead of it.
That must dampen enthusiasm for learning other languages.
Also, could you provide a source for the fact that English literacy rates are actually decreasing? I find that difficult to believe.
And as I understand it, it's improving. Catalonia's fortunate in that most people are bilingual to begin with, which is known to ease the introduction of other languages considerably.
I didn't say the English literacy rates are decreasing, I'm simply stating that they speak a whole more English in the north than in the south as far as young people go and it generally surprises me how bad English among young people here is. Is it because while they do learn English in schools, they don't practice it enough? Certainly can't be the case in Barcelona, right?