I think some powerful man insists to do such a crazy idea like this.
Japan mulls daylight savings proposal for 2020 Olympics: report | Reuters
If daylight saving time would take effect for good, that might make sense. But just for 2019 and 2020? and it will be back to normal from 2021?
Daylight saving time makes you get sleep disorder.
I think that we should shift the holding period of the Olympic Games in Tokyo 2020 in October. The same as 1964.
1964 Summer Olympics - Wikipedia
If it's impossible to reschedule, they should to think about the start time shift without daylight saving time.