Ronaldo is not going anywhere for the time being. I think all he cares about is the money. Why else would he stay at United when he knew he wouldn't be a starting player again? He had the choice of clubs. United are not playing the Champions League this year, there were plenty of clubs he could go to and play CL. Shame to see a great player fade away. I think PSG has made quite an impression so far. In my eyes they are the favorites to win the title and not City.
Of course he will stay with Man United because before this Ronaldo had agree a contract until this summer plus the option to extend one season
Talking about the Champions League favorites, this season is a little different from last season, the strongest candidates to win the Champions League are not only Man City and PSG. Barcelona, Bayern, Napoli, Madrid and Milan are playing quite well so far, they will be the biggest challenge forPSG and Man City if want to win the Champions League this season