Since all supplies of money, whether they be Steem Dollars or US Dollars or Bitcoin are created out of nothing and only have value because someone or something demands them, I think this is a good approach to help stabilize the value of the US Dollar. The last thing we need is people carrying around shopping bags full of US Dollars try to buy some Steem.
As of now, there is not much danger of that. US Dollar inflation is near zero, while Steem supply is rapidly increasing with a rate in the hundreds percent.