Ethereum is now pumping, with the current value of 294 US dollars, it gained 16.66 USD that 6 percent market increase in the last 30mins. So yes Ethereum can decline to any of the speculated amount but it can also pump back stronger.
It looks like the price of $ 400 could occur in September, August is the worst month for ethereum because the drop is more than 70% compared to June, but I am sure that the price of ethereum soon recovered and reached $ 400.