If Al Nassr do not win the SPL or a famous competition Cristiano could leave. He signed for 2 years but Al Nassr are not allowed to force him to say. Cristiano must accept the second year deal otherwise he can leave as a free player. Al Nassr have Felix with Cristiano to score goals. They should win the SPL.
Cristiano Ronaldo will probably retire from football at the end of these two years anyway. That's why I don't think he'll leave the team. He could spend his final years here, earn a good living one last time, and then retire. Or, he could stay in Saudi Arabia and finish his career with Sporting Lisbon for one last year. Al-Nassr has a serious chance of winning the championship this year. The squad is well-built, and the team looks very good.
I think Ronaldo will end his career at Al Nassr, especially since he's already become a part of the team. His retirement is hard to predict, as he's still physically strong despite his age. But I think he'll retire from the national team after the World Cup.
Back to the SPL. Al Nassr has had a very impressive start to the season, especially with Joe Filex becoming increasingly integrated into the team. This landslide victory certainly opens up new hope for Al Nassr as a serious contender for the SPL trophy this season. With the squad that Al Nassr has and the team's spirit at the start of the season, I think Al Nassr can win the SPL trophy this season, and this would also be Ronaldo's first SPL trophy.