GB, there were other factors at play in both of those investments - AirAsia was blocked by the Vietnamese government from using their name (in part due to lobbying by Jetstar) so they chose not to go ahead. In Japan they couldn't agree with ANA on how to run the airline, and ANA in the end had a gutful so they pulled the pin.
Jetstar Japan (and AirAsia for that matter) have run foul of the local regulators before, so I think that has slowed down their progress in the short term.