VANCOUVER, British Columbia —After the party, there’s the cleanup and, unfortunately, that pesky hangover. With the 2015 Women’s World Cup having reached its thrilling conclusion, there’s now the inevitable question about what happens next for women’s soccer.Like the aftermath of almost all the Women’s World Cups dating back to 1999, the main theme will wrap around this central schism: How come a women’s international soccer tournament can generate so much short-term interest and yet struggle to build sustainable opportunities for professional women to play and for fans to build supportive relationships?It’s a question for the U.S. and also countries like Japan, Germany, Sweden, France and England, which also have women’s professional soccer leagues.Just look at Japan after 2011. That earthquake-ravaged and tsunami-traumatized country was galvanized by the inspirational win by Homare Sawa and the rest of the Nadeshiko side. But the bounce from that momentous occasion hasn’t lasted.”When we won the World Cup, people began to take notice of soccer in Asia. But the popularity has begun to decline. So I hope that by winning this World Cup we can make soccer a part of the Japanese culture, not just a fad,” Japan midfielder Aya Miyama said on the eve…