No, Mt. Gox Payouts Aren’t Going to Torpedo Bitcoin's Price

Then they would all have to dump all their BTC on the exchanges at once. This would mean either everyone would ask for their payouts in cash only – meaning the trustee would cash out the BTC all at once (unlikely) – or everyone would opt to get their BTC, BCH and cash combination payouts and coordinate to dump it all at the same time (again, unlikely) Then everyone would have to opt for their BCH, BTC and cash combinations payouts to get all of that bitcoin at once, meaning everyone would dump all of their BTC at once – or all of it all in cash, or all over the exchange exchange. Then everyone will have to ask for all of the payouts only to get the cash combination. Source