That dominance in the French League is not happening now, as for the past few seasons, no team has been able to break their dominance in the league. Now, PSG's abilities are far above the average club in the league, and it seems difficult for any team to compete with them for the Ligue 1 title. PSG's level is rising, as they have become one of the strongest teams in Europe, and if Luis Enrique can maintain this level of performance, they will become a formidable team to be feared by opponents.
Now, PSG's strength level is so different from before that all teams in Ligue 1 will have no hope of preventing PSG from winning the Ligue 1 title next season. Ligue 1 is no longer a formidable challenge for PSG with their current form, but I believe PSG will still have to fight harder for the Champions League, even though their current strength is much stronger than before.
PSG has been winning the Ligue1 for so many years now even before they finally won the champions league, if they focus too much on the champions League next season which is what will likely going to happen another team may take advantage of that to challenge them for the league title next season so yes anything is possible in football Bayer Leverkusen did it last two seasons and another team can do it by snatching the league from them.