If he goes to Saudi then I think many people (including myself) will lose almost all their respect for him.
He is already a BILLIONAIRE. And he is among the top 3-5 most famous athletes alive (along with MJ, CR7, LBJ, Federer etc). He will be earning millions from endorsements and advertisements for the rest of his life. There is no reason to chase even more money, other than pure greed. And people are saying (if you were in his shoes,you would go to). No man, if I had a billion dollars, I would prioritize my and my family's well-being and happiness
Plus, he is still one of the top players of the world, if he is focused. It is not like that he is completely finished.
I don't know the details, but why can he not come to Barca with the minimum wage (aka "free")? Does he need to make 10 Million a year even now? Unless we are so fucked financially that we cannot even register players with the minimum wage.
If it is indeed to financially impossible to come to Barca (even as a loan through Inter Miami), he is still good enough to go to the Prem or Serie A. But if he feels he doesn't have it in him to compete for a whole season, especially in a high demand environment like the Prem or the CL (which could be understandable after winning everything possible in football), then there are still other options.
He could go to Argentina and play for his boyhood club Newells, like he always used to promise. That would be the most fitting end (other than Barca). Plus he will be hailed as a hero everywhere there after the WC
And even if he does not want to move in Argentina (there were some shady stories with the mafia?), then even the US is a better option than Saudi, simply because they do not openly violate human rights like the SA.