There are a few reasons why this wouldn't work:
-The League is hardly successful, as there isn't enough interest in that sort of thing.
-Wi-Fi is a less popular form of battling.
-Not as many of our top battlers do Wi-Fi battling, so we wouldn't have as high a skill level for the gyms.
-Wi-Fi tournaments haven't been successful in the past.
Because of these reasons, I can't see a Wi-Fi League in the future.