Real Madrid, Barcelona and Atletico Madrid will battle until the end.
Of course, this is not nice from a gambler's point of view, but the show is magnificent, of course i prefer the show
Atletico Madrid is not the title race. They're so inconsistent, and have no DNA to win the title. So i remove them. So i have only Barcelona / Real Madrid to win the title.

Gamblers are now only having Madrid / Barcelona to bet on winning the title, which much easier than before. I wonder why you called it not nice for gamblers. As far as i know, La liga has been the easist league to predict the winner after Bundesliga.
The inconsistency is obvious, though they have shown some support by not loosing games, they are among the team with least number of loses but the number of goals to scored so far is very small. There is no way Atletico will want to be at the same level with Real Madrid and Barcelona, they are too different to be at the same place, it's either they are at the top of the the two teams or they are at the bottom of the two teams and fight now, that's what they are doing.
Atletico can also be used to gamble, you don't have to pick every team to win. Even the Barcelona and Real Madrid that do have the ways of winning matches, they don't have big odd. So if you chose them as straight win in their matches, you are likely to get small reward as it's easy to predict. The harder the prediction, the bigger the outcome and so are match that are very unpredictable, you can always use under for Atletico Madrid to get juicy odds.