Lawrence Stroll seems keen to work with him more, but I think that'll develop over a longer period than Hamilton has left in the sport.Is there still talk of Toto leaving? That's the only thing that I can think that would upset the applecart.
I think the "theory" is that Mercedes want to decrease their financial commitment to F1, with the team being self-funding. The budget cap helps, but is still likely to leave a lot of unemployed Mercedes engineers. Stroll would be looking to do some kind of deal with Mercedes/Toto to set up a much closer relationship between Aston Martin/Mercedes/Mercedes F1/Racing Point, helping Mercedes F1 to have the resources to continue to dominate F1, and helping Aston Martin Racing Point become a more frontrunning F1 team. Who knows maybe even an option to get Lance into a Merc seat... Toto would be well-suited to an overarching role across all four organisation.
