Yes but even that in a way is a good thing - he'd have less pressure in adapting to their team and be better rested to do well in the Champions league which is clearly the next challenge that he is keen for. Moving to PSG wouldn't be where he dreamed of ending up, one of the Spanish clubs would be my guess as his ultimate goal.Step down in League. Big decision for him.
Also factor in that Paris isn't that far from Brussels - he'd be able to see his family (and his Dad who was ill) far more often and also have them visit him.
I hope to goodness he doesn't see it that way mind and he rolls the dice on staying next season to see if we can pull it all together but if I'm honest I think it unlikely