People can't withdraw real money -> ppl are forced to buy bitcoins with their MtGox dollars. It's great
After Silk Road issue, it became more apparent that at any moment bitcoin businesses, like MtGox, can get terminated. You don't want your real money in there that you can't get out. You are forced to buy coins to get out of immediate danger zone called 'MtGox'. If you finally want to actually have gained something in real life, you must withdraw real money, but you can't right now, or you have to take a huge risk of facing MtGox termination.
Pretty much bitcoin sheeple got cornered. And it's great for the price
The outsiders naive guy might think bitcoin is doing great and its time to buy because the price going up, unbeknownst why it is rising. If such a person adds real money, his kind could save MtGox from death (MtGox is insolvent), but I personally think there aren't enough people anymore willing to put new real money in, most people know Bitcoin by now and know its uses (or lack thereof).
It's sad for the sheeple but great for traders like myself, who are in BTC trackers.