President of the United States: Joe Biden, with Kamala Harris as President-elect.
Chancellor of Germany: Heiko Maas
President of France: Marine Le Pen
Prime Minister of the United Kingdom: Boris Johnson
Prime Minister of Canada: Justin Trudeau
Prime Minister of Australia: No clue
Nah, he is considered a rather mediocre Foreign Minister, plus it is highly unlikely the SPD will recover by then. He lost state elections he ran for three times in a row and even in case of an (unlikely) SPD recovery, state governors who could prove to win by then (Manuela Schwesig, Stephan Weil?) seem more suited to be the SPD candidate for Chancellor.