~Barcelona and Atletico Madrid missing far points from Real Madrid each other left than 16 points, although have 18 match I think not easy for Barcelona and Atletico Madrid getting close points with Real Madrid or Sevilla, just take way how to get four top position only as possibility for both team.
We can conclude that only Real Madrid and Sevilla compete for the title. Atletico Madrid and Barcelona are clearly out of the title race this season since their point gaps are too far from Real Madrid or Sevilla points. You are right, the realistic target for both Atletico Madrid and Barcelona is to be back on the top four (UCL zone). At least, they can get UCL tickets for the next season.
It still really depends on how Sevilla and Real Madrid end the match on matchday 21-34. I agree that Real Madrid will probably continue to consistently win every match, but I don't believe in Sevilla.
Considering the current performance of Real Madrid, I agree that Real Madrid will have a chance to secure 3 points in each match. They must be aware that losing to get 3 points will risk their position on the top, so they must try their best efforts in each match. They have an experienced coach (Ancellotti) and they also have many experienced players on the squad, there are no reasons to doubt Real Madrid.