I guess if the Dollar drops from here, sure the Yen could be 155 per dollar. Time frame hard to guess. I think its all up to the Bankers. They are operating like a global social welfare office.
It’s like the entire world has only two countries. One is the USA, and the other is ‘all others’. High dollar helps ‘others’, low dollar helps USA. They seem to alternate currency values, like watering your lawn in different spots.