Catalan just declared the independence, I hope La Liga allow Barcelona to stick with La Liga, there are many disadvantages if Barcelona decided to join another league if Barcelona join a French league or EPL they should start from the lowest league, and if Catalan make their own league, it's not competitive and they must wait a couple years to join UCL
Catalan government has declared independence backed by a minority of votes and that independence hasnt been recognized by any serious government yet. I think only Maduro, from Venezuela.
Catalan government has been fired and face very serious charges. Most of them will be imprisoned soon.
So, they will stay in la Liga but because they are still in Spain.
Had that been otherwise, I would strongly support they were kicked from la Liga. You cannot want to be independent have all the benefits of being attached to Spain.
The problem is when Barcelona decided to join another league(English or French) Barcelona have to start from the lowest tier of their league, and the distance would be a problem if they join to English league, good things is if they allow Barcelona to join straight into their highest tier league. and if Catalan creates their own league, it will not be competitive and it requires some years for Barcelona to join UCL.