That's a compelling post you have made here because I haven't thought about potential Ballon d’Or winners yet and I didn't follow Dembele's goals and assists, but these numbers speak for themselves. His biggest disadvantage is that he plays for PSG unless they win the Champions League. Then he has done what Messi, Mbappe and Neymar could not do with PSG and he keeps that form and keeps scoring and assisting like that in all competitions, you are right he could be a prospective Ballon d’Or winner!
If they don't win the Champions League, the chances to win the Ballon d’Or are low. PSG doesn't have the same reputational leverage as Real Madrid and Dembele hasn't made a name for himself throughout his whole career.
PSG have made great strides and they have consistently been able to produce top results in Ligue 1 and I believe this is something that is much easier for them to achieve because the competition in that league is not much better than PSG themselves. Dembele has had a pretty impressive season compared to his usual injury-prone form and he has made a big contribution to the results that PSG have achieved so far.
Ballon d'Or is every player's dream and it may take hard work to get it and it can be realized by Dembele when they managed to win the Champions League. Although sometimes there is no guarantee when winning the Champions League every favorite player can get the Ballon d'Or.