JB has a lot of credibility to bring to a team like Williams.
No doubt, but he is expensive.
And Williams have nothing like the budget of Merc, Ferrari, Red Bull or McLaren.
I fear they might go the pay driver route or at least someone who brings sponsorship with them. Perez being a good shout as mentioned.
JB seems like a top bloke and if he does retire I’m sure he find plenty of other potential opportunities
What definitely wouldn’t be fair is the undignified spectacle of one of the sport’s longest serving drivers and former champion driving around in the final race of the season not knowing if it was his last race in the sport or not. So hopefully McLaren will have the decency to sort out their driver line up before the final race of the season