I do not think that this will go on forever. We always said the streak will end with Lewy, Müller and Neuer. And this season, with Lewy gone, Neuer injured we weren't far from it. That we scored 18 of the 20 goals with Tuchel when Müller was on the pitch and only two when he was not doesn't make that thinking less unrealistic...
Bayern is not really a comfort zone for Kane. If you do not win in Munich things get very unpleasant. And Kane would go from a team with less than 50% ball possession to one that has to be dominant and has a lot ball possession and the other team parking the bus. He has to adapt his game to that.
It would mean that he goes out of his comfort zone at Tottenham into another country, into another league with other rules and from the little pond into the "big pond" were he is not the homegrown kid that always has the sympathy of the fans but has to first earn them. He can learn a lot there.
For the English national team that actually could be a big advantage.