I doubt that Cristiano Ronaldo will be able to wear the national jersey again. He doesn't want it, and the coach may not invite him to the squad again after the world cup. Ronaldo is a football player who has left his mark on world football, and no one can claim otherwise. He brought the Portuguese national team to the next level. I think he will leave the task to the young players now.
If Ronaldo wears the national jersey again, that will be for Saudi Arabia and not for Portugal. After all the bitter experiences that he had during Qatar 2022, I don't think that he will consider playing for Portugal again. Also, Portuguese management won't be much interested in Ronaldo, given the fact that he has moved to Al Nassr. Ronaldo helped Portugal to become one of the top football superpowers in the world. But that era has ended now and both the sides should now move on with their respective future paths.