New candidates for Barca presidency will campaign with locking Messi down for life. He would have no problem with Barca if they were much better state for winning trophies, and that matches new candidates project as well.
On the other hand we could have Pep still not renew until March and big question marks surely would come up at that point about him leaving, and believe me Messi would not entertain a City move without Pep at the bench.
He will imo renew under new board.
There is even chance they can push Bartomeu out before March, but March the latest he will be gone. Messi for that reason will wait until March, no chance imo for January deals/pre contract and stuff.