I see a very low chance for Sevilla to reach the title at the end of this season. It is because they are not a consistent team lately. And this must be really frustrating for them and the supporters. Sevilla just need to have a lasting winning streak to really have a chance. Real Madrid are a very strong team now and they are playing fascinatingly. While there is a scenario like this, I don't see Sevilla winning the title in some way. But I still appreciate their high effort a lot. They are better than the previous season at least.
There is a big difference compared to last year. They finished the League in fourth place last year, but already the biggest contender for second place is Sevilla. This year, they have performed quite well compared to last year. Of course, last year Barcelona finished the League ahead of Sevilla because it was better than this year. They was also at the top of Atlético Madrid. These two teams are quite far from last year's image. There is only Real Madrid that looks stable and they are my favorites for the championship.
But Sevilla still have a chance to fight for the Trophy, 13 games remaining and we don't know what happens in the next match. Real madrid must build up stamina in good performance to keep winning meanwhile Barcelona can still catch up for second place performance on getting better, so Real madrid must continue to be wary of sevilla it will continue fight to win.
I don't think Real Madrid underestimates any team. It is clear that Sevilla is their rival, with a difference of 6 points. The difference of 6 points is not an insurmountable difference. If Real Madrid lose a few points and Sevilla wins, this gap will of course close. Real Madrid, who is aware of this, will try to play every match like a final. That's why I see low Sevilla catching them.
Although in the last match Sevilla failed to win against Espanyol, but this will not make Real Madrid calm. Because the difference of 6 points with
Sevilla is still not safe, because there are 13 more games to play, so there is still the possibility of Sevilla chasing points owned by Real Madrid.
Real Madrid are very aware of this, so as you said, Real Madrid will fight to win every remaining game. But the problem is football is often a surprise,
there is a possibility of Real Madrid dropping points in some games. As in the last 5 matches Real Madrid failed to win twice, meaning Real Madrid
will not always win. So La Liga is still fun to follow until the end of the season, there is still the possibility of Sevilla chasing Real Madrid's points.
Although I'm actually optimistic that Real Madrid will win the trophy this season.