The way i see the rest of the grid now is this:
Scuderia Ferrari: Vettel/Le Clerc - Vettel is on till 2020, Le Clerc will take his seat as i think they want to get rid of Kimi now and its time to see what Le Clerc can do.
Team Silverstone-Mercedes: Perez/Stroll - Perez will sign a 2 year deal, bring his sponsor money, Stroll will join his dads team. Stroll will bring more luxury branding to the F1 grid, to witch BWT will be looking for a new team to go to... More later.
Scuderia Toro Rosso-Honda: Vandoorne/Vergne - I can see this pairing for a year, with both drivers facing off for a 2020 deal. As i think Red Bull will place Ticktum there in 2020.
Haas-Ferrari: Grosjean/Magnussen - No change, Kevin has done a great early season job, and Romain has been great mid season so far. If they can give them a car that is great on the breaks for Romain and better in the lower speed corners for Kevin, watch them fly for 2019.
Alfa Romeo Sauber-Ferrari: Ericson/Giovinazzi - Markus backers will want to see another year for him before they decide to see what they want to do from 2020 onward, Antonio will be placed here for Ferrari to get him a year, and give Sauber a discounted supply.
BWT Williams-Mercedes: Ocon/Russell - Two Mercedes drivers, yes, Toto will offer both to Paddy and Claire for them to have a massive discount on the Mercedes bill and for more engine software. Williams will have the pick on drivers, and both will be the best of the rest on show.
As for BWT, they will be shopping for a new team as BWT are seeing a massive increase in their sales since F1 Sponsorship began, they gave Force India €27.5m a season, and Williams need a replacement for Martini (€35m) and Rexona/Sure/Degree (€13m) from next year, and id be confident to say that if BWT offered €30m a season for title sponsorship they would have it here, as long as Williams could find two or three other companies to take up the €18m shortfall. Unilever (Owners of Sure/Rexona/Degree) could have shopped for a new team in F1, or have been pitched by another, higher up the grid.