How would Wenger do to La liga what he did to PL. Buying foreign footballers and telling players half time beer doesn't give you a boost would not help Barcelona much.
I already pondered this in the Wenger thread but it would be very different job as they want instant success. No projects and nurturing players.The league is less competitive but their main rivals aren't which means winner propably needs more points than in England and playing 1st team in every match is necessary when being pretty much tied to Real Madrid whole season who also can go unbeaten in 30 games or so.
It would be hilarious though. And very interesting to see how we would do. I'm not saying he would fail. But nothing in recent history makes me as confident as you about him.
Funny thing is i just saw some Real Madrid fans talking about Wenger possibly being there next season.