Clearly McLaren and Hamilton are going through the contractual motions and the season end can't come soon enough. For second race he started the weekend fast and beaming and by FP3 he's at a loss to explain and the team are hardly trying for him. Button on other hand seems to be able to find consistency and performance severely missing not that many races ago.
In a way once the decisions are made, like the end others of any relationship, it would be best to break away and either join Mercedes now as Schumacher is also finding motivation hard to maintain, or go on a long break. Hamilton knows in reality the championship is gone, without some strange happenings, he said do himself, so subject to agreement, time to shift. Unheard of but given what is in plain sight, it wouldn't be so bad.