Currently he is 31 years old for next season he will be 32 years old if he decides to go to Saudi Arabia for 2 years and return to the European league it is a bad idea no European club wants to recruit Pogba because his age is getting older and he is also prone to injury than the risk for the club that recruits him so it is better to continue to be in Saudi Arabia until he retires like Ronaldo who will most likely end his football career in Saudi Arabia when he has fulfilled what he wants.
Very few European players who are 31 years old will be productive and even if there are only a few players so Pogba's chances of performing at his best are almost certain to end. After playing in the Arab League and moving back to Europe then the question is which club will be willing to recruit and give him a big salary. So it is almost impossible for that scenario to work well and I think playing in the Saudi Arabian League will be much more profitable for him financially. There he can also collect more money and retire after seeing the development of football against him no longer getting his best quality.
There are almost no more European players over 30 years old, maybe 1 or 2 more seasons for players over 30 years old to be in the European League. I am more confident that Paul Pogba will continue to play in the Arab League there. He will be comfortable playing because the competition is not as tough as the European League.
Physically and in terms of performance, it is impossible for a European club to sign him for a big salary, especially since Pogba is prone to injury, so he cannot fully play the quality of the game. Again, this scenario will not happen if you look at your age and physical condition which is already starting to decline.