Manufacturing is only ~18% of the Japanese economy, and that share is shrinking fast as Japan outsources its factories to China and SE Asia. For the rest, 180 yen to the dollar would just drive higher inflation through eg. fuel prices despite stagnant wages, further weakening the economy.
That said, I'm not seeing 180 yen to the dollar any time soon, by most measures the yen is already undervalued. (With the glaring exception of yen vs national debt, but that particular ticking time bomb is not showing imminent signs of explosion.)
That said, I'm not seeing 180 yen to the dollar any time soon, by most measures the yen is already undervalued. (With the glaring exception of yen vs national debt, but that particular ticking time bomb is not showing imminent signs of explosion.)