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.
While I would say you are wrong when it comes to someone else, you could be right about Pogba. Normally, even if a player doesn't play for 2-3 years, when they are 31 years old, if they were any good before the break, and if they kept their shape up as well then I would say that they can make a comeback. Sure it would take a while for them to get back on form, and as far as I know Pogba will come back on March right? Then in that case we could see Pogba end up with being not that good this season, from March towards May when most leagues end, that would make sense and I understand that and should not be worried about it.
But at the end of the day, Pogba is different because he has always been a bit of a problem for most teams he has been on, he has always been a very talented player but he has been personally creating issues wherever he goes to and this is why I believe that any team who gets him will regret it, not because of the break or anything, but he is not worth it.