Cherry blossoms are not a major driver of visitors to Tokyo, compared with, say, university examinations.

"It must be the cherry blossoms," appears to be a trope that people on social media turn to when faced with Japan travel-related phenomena that they can't explain.

I can't get a seat on that train... It must be the cherry blossoms.
Hotel rooms are more expensive than they were when few people traveled ... That's weird because there aren't any cherry blossoms.

I am a little bored with it, so I may start throwing in alternative explanations - the phases of the moon or the demands of the mountain gods.