is this the reason for the drop in price?
Weird?
It does seem to be the reason for the drop in price. Whether the price should drop is not so clear to me, though. Previously, when Gox only blocked fiat withdrawals, it was obvious that the USD/BTC price should be higher there than on other exchanges. The bitcoin there were worth just as much, but a "dollar" on Gox was worth less than a real dollar. However, if both the denominator and the numerator are going to zero, then what is a fair exchange rate between "Gox dollars" and "Gox bitcoin"?
Personally, if I had not abandoned Gox a year ago after they embezzled from me, I would be buying bitcoin there. Although neither fiat nor bitcoin withdrawals are working as they should now, it's much still much more likely that you'll be able to get your bitcoin out of there than that they'll pay you in fiat. If anything, I would think that this news should be causing a spike in the price at Gox. Expect the volatility to keep rising there if they don't resolve this soon.
If this does turn out to be just a massive technical glitch, then the main effect will be to slightly reduce faith in bitcoin generally and thus drive the price down at all exchanges. On the other hand, it will certainly drive even more people away from Gox, which can only be good for the bitcoin community in the long run, IMHO.