"My vote would be to go the other way - instead of reducing available assets in an effort to simply/boost pricing/whatever, pull the Bitshares DEX directly into the Steem ecosystem. Allow Steem users to store value in whatever way they choose via bitAssets. bitGOLD, bitSILVER, bitCNY, etc."
That is a cool idea and I have been thinking about something similar myself. A voting interface on top and then unlimited tokens on the protocol level.
PM me if you want to talk.