I don't think any other team will compete with PSG for the Ligue 1 title this season. Marseille and Monaco played very well at the beginning of the season. But both of these teams are now far behind. Marseille is 7 points behind PSG and Monaco is 10 points behind. It will not be possible for these teams to close such a big gap. Moreover, Monaco and Marseille's performance is not consistent.
Although PSG has lost points in a few matches, PSG is still undefeated in Ligue 1. Now Luis Enrique's goal is to do well in the Champions League. So maybe PSG may lose points in a few more matches in Ligue 1. However, PSG will not suffer much from this. PSG will win the Ligue 1 title this season as well.
PSG rarely experience competition in Ligue 1, as soon as they have some more or less worthy opponent, they immediately sell their players and become uncompetitive the next season, because for them it is just a business. And PSG sets completely different goals, they strive to win all the tournaments, only with the Champions League they have difficulties. Now Enrique will try to strengthen the attack of PSG, maybe he will succeed if they make several good transfers, but even without this no one will overtake them in Ligue 1.
That's right. Ligue 1 is dominated by PSG because other teams sometimes only think about business or because of unstable finances so they often sell players who have potential. So if you want Ligue 1 to be competitive, there must be someone who can compete with PSG in terms of finances. The transfer market in the French League is focused on only one team so that its abilities are not evenly distributed unlike the English, Italian and Spanish Leagues. In addition, the French League clubs are not trained by great coaches who can make the clubs competitive. Just look at the composition of coaches in the French League 1 which is rarely occupied by top coaches, as a result only PSG always dominates League 1.
If asked why PSG finds it difficult to become Champions League champions. This goes back to the explanation above because their league is not competitive so when PSG plays in the Champions League they do not have the fighting spirit and do not have the mentality because in League 1 they do not need that, they are too dominant, no team is able to compete with them.