There's no way Ronaldo is leaving if Madrid doesn't want to. his clause is for 1000 million euros, which forces him to negotiate with the team if he wants to leave.

I do think it would be possible Madrid trades him for Neymar or sells him out if someone comes to offer something around 250 million euros, but there aren't many teams that can do that, and Madrid really wants Neymar...I don't know if that's a good trade for PSG though, they are interested in publicity and Cristiano is a lot more commercial than Neymar...but he is also older.