With more stringent FFP and profitability rules in Spanish and European competition, I think it's harder for clubs to come in and simply splurge their way to the top (look at Newcastle).
They have an advantage in terms of being plugged into a multi club network which gives them a talent and administrarive advantage over similarly sized clubs (an unfair advantage which should be banned) but that alone won't be enough to have them dominate a league occupied by Real Madrid and Barcelona.
And my original comment scoffed at the idea that the league (La Liga) wasn't already spoiled. Isn't that why Perez and Laporta are trying to ditch their league and create the Super League?