The next court proceeding for Mt. Gox bankruptcy won’t happen until Sept 18, 2018. Before then, Nobuaki Kobayashi will not have authorization to dump the remaining 160K Bitcoin on the open market.
The 24 hour trading volume of Bitcoin is 724K BTC. That being said, dumping the remaining 160K Bitcoin on the open market would affect the price, but it’s impossible to tell how much and probably not for very long.