I think Barcelona will make every effort to repatriate Lionel Messi, especially the option of selling players that they will carry out in the transfer season window to balance their expenses.
Chance to win Champions League with Barcelona is small and they are not able to pay high salary for Messi. It pluses with bad treatment they gave to Messi two years ago, they will not have chance to convince him to return.
Messi's current condition is being hit by some unfavorable news at PSG, which of course is used as a momentum to return to raising attention to news like this.
Regardless of what it ends up like, in this case I'm not the one who cares whether he will return to Barcelona or not, it's just that even Messi and Barcelona have the same interest, so what? there needs to be a clear reason to bring Messi back and I don't think performance is something to justify in this case.
On the other hand, sacrificing Gavi with promising long-term prospects for Messi, who is nearing the end of his career, is not worth it.