Would be REALLY SMART for another Exchange to come up here.
They would make BANK.
Lots of them are trying, but people are attached to Gox because they were first.
BitFloor was doing really well until they got shut down. CampBX and BitStamp are quite good too.
In some ways, the other ones are actually better. Since they're based in the US, you can do direct deposit transfers into your trading accounts from your banks. (Saving some, if not all, of the Wire transfer fees)