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Ligue 1 will not lose its popularity but PSG will lose its dominance. I actually think that without Mbappe, other teams will have the opportunity to eliminate PSG's dominance. Yes, PSG is still the #1 favorite for now, but at least they won't be as dominant as they were when they were with Mbappe. We might be able to see where PSG has to fight to win the league championship, unlike this season where PSG really dominated Ligue 1 with a goal difference of +48 goals and collected 76 points, 9 points ahead of Monaco in second place.
But I don't think I saying that Ligue 1 is losing its popularity, instead I saying that it PSG that losing popularity and dominance, try to re-understand what I saying, friend.
Moreover, PSG greatest strength lies in the contribution that Mbappe has made so far and Mbappe departure will indeed give all teams the opportunity to beat PSG more easily and allow them to have the opportunity to experience what it is like to win the Ligue 1 title.
So far, every time PSG wins, Mbappe has been successful in scoring goals, even though it not an overall win, at least the dominance given by Mbappe performance is very visible and significant.
Monaco, Brest and LOSC should be able to take advantage of this opportunity next season, it will be easier for them to beat PSG and try to have truly equal competition.
But looking at all of them, I tend to see Monaco and LOSC as team that will make things difficult for PSG next season.