Those prices are references to Mt. Gox, whopever would trade out of Mt. Gox would take their value as a reference.
What are you talking about? How are they "references to Mt. Gox"?
Gox is over. Kaput. Finito. It is now impossible to reference Gox in any way other than "the exchange that failed". There is no Gox exchange rate.
The market where people buy and sell bitcoins most certainly still exists. There are plenty of centralized exchanges still functioning as well as a few various other types of exchange (localbitcoins, OTR, FTF).
Gox is over, but the market continued from there. The reference values were already set, if i'm going to sell dollars out of Wallstreet i will not consider offer and demand where i'm going to sell it, i will ask for the Wallstreet price. Buyers will also consider fair the reference of Wallstreet. If Wallstreet was over today ou of nothing, one would still get their as a reference tomorrow.