Backgrounds: the lack of abundant bitcnys limit the progress of the Bitshares exchange.
The frequent "Black Swan events" of Bitshares make many accounts of Bitshares wipe out, leading a lower price of Bitshares. As a result, the lower price of Bitshares would make many accounts wipe out. This phenomenon makes a vicious circle of Bitshares. Unfortunately, a lower price would make many people lost the confidence on Bitshares and many new guys think Bitshares be aborted cryptocurrency.
My thoughts about the pledge of Bitshares:
In my opinion, I suggest to add other cryptocurrency (e.g. BTC, ETH) as pledge. In this way, many holders of BTC, ETH would have more money to use, which can make a stable price of Bitshares.
The above are just for discussion, I do not know whether it is useful for Bitshares. I just love "Bitshares" so such and hope its developments faster.