Why football failed to catch on in certain countries

[SecondWar]

HomokHarcos said: 

Ireland: Due to Anglophobia, native sports such as curling and Gaelic football were promoted by Irish nationalists.
Canada: The cold climate lead to ice hockey becoming the dominant sport.
United States: Baseball was the first major professional sport, American football became the dominant sport and basketball became the urban sport of participation.
India: Cricket became popular in India due to consistent competition with commonwealth countries such as England and Australia from their test nation status.
Australia: Due to Australia's physical isolation, the native sport of Australian rules became popular. Cricket remained popular due to a similar reason as India.

I know he didn't explain Japan in the video, but baseball became the dominant sport there because Americans brought the sport there and baseball became the main game at university campuses.

He probably didn't mention Japan because, even if it's not the most popular sport there, it does have a good level of popularity. The national team have won the continental tournament repeatedly and they do have a level of success at the World Cup. Also a number of star players, such as Inestia and Torres have moved there in their twilight years.