It seems way off target to argue against NuBits by attacking the US Dollar. Again, if NuBits is as sound as the USD, then it is a raging success. That appears to be the entire point.
On top of that, the NuBits protocol can use its mechanism to peg tokens against any asset, even inflation-protected assets. If the USD fails, NuBits shareholders could create a new set of tokens within the same network to peg to the value of whatever currency replaces it.