Who would fill the Mercedes seat?
Wehrlein - Merc have groomed Wehrlein for a while now, and it's always been a matter of time. However, unless Mercedes were expecting this and allowed Force India to choose Ocon so they could move Wehrlein in, he's in a little bit of trouble.
Alonso - We'd all like to see it. Alonso and Hamilton again, he's outdriven the McLaren so much and seems to still be driving as well as ever. No Ron means he could break away.
Vettel - He's probably disillusioned with Ferrari now and would jump at the opportunity.
Sainz - With Ricciardo and Verstappen looking to be staying at RB for a few years, he's not got many options. But he has been one of the unsung heroes of the season, so might take the seat if he can.
Verstappen - Merc were only just beaten to Max by Red Bull, and he is the hottest property on the market, so don't be surprised if Merc steal him.
Button - Proved he can work well with Hamilton at McLaren. May have "retired", but he said he was only going to race for fun now. A front running car counts as fun right?
Bottas - Still well regarded in the paddock, and has done very well with Mercedes engines over the last 3 years. Could be an outside chance.
Perez - He's always up there, managed to score 7 podiums with 2nd Tier cars over his career and has always deserved a front-running drive (McLaren 2013 didn't really count)