I disagree - there currently is no market without trading. Look at the volumes actually traded in the bottom chart here - it is dead:http://bitsharesblocks.com/assets/asset?id=USD
Now let me explain my reasoning for this. The new BitUSD creation market has effectively been closed down by the feed rules, which requires buyers above the peg price. As you can see the highest bid at this point is around 12% below that price. Shorts are currently reluctant to go that low, because in the absence of much movement in BTSX (no need to leverage) they pay a big upfront cost equal to the spread.
Although the existing BitUSD are free to trade where the market goes, recent buyers of BitUSD near or above the peg are reluctant to sell 12% below. So they hold for now, but as time passes, they will relent to the market reality and become more willing to release their BitUSD at lower prices. Buyers are happy to hold off at the discount, because they can see that without liquidity it will be impossible to offload again near the peg.
While the intent behind the rules is a good one, the only way to get the market to actually trade near a peg price is to allow the market to determine the right level of incentive to do so.