^ For Atletico to win La Liga it would need to over perform and need Real and Barca to under perform for a good part of the season... Kinda like what happened to Leicester at the EPL? 
Extreme situation with Leicester tho but you know what I mean.
Atletico Madrid have won the La Liga 10 times so far with the most recent on being in 2014 which is not bad at all... For Leicester, it was a one time thing and the EPL's top teams where way so poor that season, In fact if Arsenal had been serious, they would have won the title easily that season. Under Diego Simeone, ATM are very capable of winning it again if they show consistency. Extreme situation with Leicester tho but you know what I mean.They have already taken advantage of Barcelona's and Real Madrid's slip ups and all they have to do it maintain the momentum.