Hi!
I think I don’t understand your question. Maybe you can help me. But let me try to explain how buying and selling NuBits currently works.
NBT are issued by a custodian vote by the NuShares holders and sold at exchanges by custodians.
You can try to sell 1 bn. NBT for $1 (although it’s unlikely that such a vote issuing 1 bn would pass in near future).
There are no “bag holders” except for those who bought each NBT for 1 USD (likely from a custodian sell wall).
“Dumping” them would harm no one and nothing, because they simply would be sold back for 1 USD (likely to the custodian buy wall).
Remember: 1 NBT is always 1 USD!