Being able to play in the CWC is still something special especially for 40 years old player. Also, he can help FIFA to boost the ticket sales, too. Even though CWC is not as big as the world cup, but it still being considered by a major trophy after FIFA world cup.
I see it as Ronaldo's strong reason to keep his existence even in the top competition of club's level. There's nothing wrong for him to wish he can play again in CWC.
Ronaldo refuses to grow old, this is appropriate for us to give him because even though most of his peers have retired, he is still able to play at a good level even though overall there has been a decline due to the effects of age. Helping FIFA to boost ticket sales, isn't this excessive? Ronaldo still has ambitions to play in the Club World Cup because he thinks he still has the ability and it is the club where he plays that might benefit financially. But whatever happens, I am happy if in the end Ronaldo returns to play in Europe and of course this will be interesting.