Even if he plays his old football again after this stage, he will be able to play football for another 2-3 years at most. He was away from football because of the punishment he received in the ages when football should have been at its most productive. This was a situation that brought Pogban down, but of course he is the one at fault in this regard. He was banned from football because of the banned substance he used and he showed a great example of irresponsibility because he could not contribute to a team like Juventus. If Marseille transfers him now, they will be taking a great risk and making this transfer.
He won't stop that young because however when you look at the current age of 2-3 years he can still be productive even though there might be a new adaptation where smaller leagues, smaller clubs or SPL and MLS are always bringing players so he won't stop at that point.
Right now he's trying to rebuild his career due to the situation that happened before and the ban that he received so it's not a risky transfer but it's a turning point where he has to try to rebuild his career and make a splash at a new club so that he's not considered finished.
Marseille is quite ideal for now because we can see this season alone Greenwood, who has indeed become a mockery in England because of the problems he received, was able to be welcomed and regain his current form so it does not rule out the possibility of Pogba doing the same especially since De Zerbi is quite clever when utilising player potential.