Catalonia can form it’s own league.
The talent there is just as good as anywhere else.
Besides, I’d guess to say that Spain will remain united in a form sort of like Switzerland is. That nation is a hodge podge of German, French, Italian and Romanisch.
Talk about a big fish in a small pond, it will be like Celtic in Scotland.
What I’ve heard is that the French Ligue 1 would take Barca, if Catalonia went independent.