I presume the secessionists are actually a minority. The effect is already in full force
I've got a colleague in Catalonia. At the time of the referendum, he was working here in the UK, and he went back to vote in the attempted referendum; and he participated in the general strike a few weeks ago after the sentencing of the leaders who ran the referendum.
He's a level-headed, laid-back kind of guy, not at all the type that gets worked up and inflamed over trifles. If he's upset enough at Madrid to participate in this, I think Madrid are the bad guys here. I don't think he necessarily wants to secede per se, but from his perspective they've basically tried everything else.
But it was still over 90% result.