I think Messi decided to rejoin Barcelona to play for few more seasons and leave the club amicably with a proper send forth unlike his last unceremoniously exist to PSG which caused some rift between the club and him, of course his entire playing career was spent in Barcelona thus should be rewarded with a club legend status when he finally quit accepting a paycut to rejoin a club that made him a star isn't a bad idea of course other players could be tempted with mouth watering contract offered by the Saudi Arabian clubs, personally I think Messi return to Barcelona wouldn't bear any consequence rather both parties will benefit.
This is an opportunity for Messi to become the highest-paid sportsman in the world. I am not sure this opportunity will be as lucrative as it is now next year. He needs to move now that he is highly needed. Messi is already a legend in Barcelona and he has won everything. His return might be even disastrous because he might not have all the attention he use to have. After all, Robert Lewandowski is now the key player. Maybe he can return to Barca after two years in the SPL league and take up a managerial job.
I understand those who want to see something emotional, that's the feeling we all have. I agree that if he went to Barcelona and played like 1-2 more seasons there and retire there it would be something to see, hell I didn't want him to leave in the first place so it would be normal for people to see him there.
However, I agree that we are talking too emotionally, and this is just way too much money we are talking about that can't be rejected. If he is actually offered 1 billion a year, which I still decline to believe, I think it must be a lot less than that, I mean the money he receives must be a lot smaller than that, but if it's anything even remotely true, like even if he gets 500 million a year, it would be very very stupid to reject that, it's insane amount of money.