I also do not think they will be willing to make any changes currently, because what they have already is working for them greatly. Altering it may cost them some more, they just have to improve it, by having a second squad that good, so that incase anything comes up, it will be very easy for them to rotate and still have that same performance they always do have.
PSG biggest problem is winning the Champions League, any other thing is secondary to their problems. Whether PSG adjusts the squad, use the worst players, they have more chances of celebrating the league title over any other club in the French League.
PSG worse season is sometimes the best season for most clubs in the league. PSG focus is in winning the Champions League, and only what they need is squad upgrade, in a case of injury or players losing form.