If Belgia win WC, it could be Kevin de bruyne's, imo. He's the PFA player of the year (or should be), remember. And MC has enough local silverware to support him.
If England win it, Harry Kane could enter the final three, but it still needs a miracle for him grabbing the title from Messi or Ronaldo. Even entering top three is already an achievement since Tottenham is nothing in EPL and he wasn't last year top scorer.
If Croatia win it, Modrid is a serious contender for top three, but again, it will depend on many things in order to grab that ballon. Not going to be easy.
If France win it, no, it's not Mbappe's time yet. And I doubt even Griezmann's. Definitely no for Pogba. Simply back to cristiano or Messi or (insert random player here) and the winner goes to the first two. Or maybe Griezmann will take the third slot, but that's it.
Ronaldo was the top scorer and champion but flopped during the semifinal and final and Madrid got lucky in the quarter. It wasn't a smooth UCL for Madrid with a lot of decision issues and Ramos issues, too. And he and Madrid was a mess in league last year.