no the market wont crash due to hacks. only the bad news can affect the price for short term.
the bitcoins which were stolen are still in the blockchain pool, they are not gone, also they are tracable which makes the anonym cashout at such large sums very hard. they cant spam the bitcoins in exchanges in large amounts to affect the prices.
also such amounts of stolen bitcoins to cashout its common to do it by cash in person, so its no big buy or sell order which get logged on the exchange sites to dump or pump the prices as the trade is under the radar.
so no the only reason the prices gets dumped while the bad news of hacked exchanges are displayed, is only the fear of the ppl