This time I don't agree with you, Ronaldo still has a chance to play in the Champions League. Ronaldo contract with Manchester United is almost complete, after which Ronaldo will be on a free transfer. Big teams in Europe don't mind hosting Ronaldo because they can get Ronaldo services for free. Even though Ronaldo is absent in the Champions League, he still has the opportunity to play in the most elite League on the European continent because his charm is still able to attract big teams when he is on a free transfer.
But you have to remember, even though Ronaldo is already rich, to get him the club still has to pay more than other players. Maybe, the sale of merchandise and stadium tickets as well as sponsorship will be quite increased, but the question is, from all that money can cover Ronaldo's with minimum for 1 year salary? If this can be achieved, it may be easy for the club to sign Ronaldo.