I don't think English is going anywhere as a global language, even if the US/UK's power recedes. Go anywhere in the world (especially Europe or East Asia) and the default in-between language between two foreigners is English, even if it's not the native language of either person. E.g., when a Japanese person orders a coffee in Munich from a French barista, the conversation is in English, not German.
I think you mean Italian ;) And if the Japanese person is staying long-term and not a tourist, they'll likely quickly learn to embed their choice of {espresso, latte macchiato, cappuccino, ...} within the "Ein %s bitte." "Danke." template.
