Qora had this feature and at one point I wanted to create a couple of peg currencies for Qora to USD, GBP and BTC.  After that, I wanted to setup, internal markets for assets that were virtual representations of real world commodities such as gold, silver, oil, LTC, DOGE, etc.  The idea was that I would you could take your Qora and buy the fiat asset at a floating spot-price, that was pegged based off of currency price APIs from various exchanges.  You could then use your virtual USD/GBP/BTC to buy commodity or alt-coin assets strictly with those assets, rather than the parent currency (Qora.)  This means that the price for Qora (or in this case, it would be Waze) could fluctuate but so long as a sub-market in the blockchain if valued off of a pegged asset (USD, BTC, etc.) the price of your investment was stabilized.

The only risk is trusting that the issuer will keep a trustworthy spread and not back out. But, even if the issuer disappeared, this wouldn't be a big deal if the markets were active, well established, and everyone already had tools in place to monitor real-world markets and move the markets on their own.

I didn't do this because of time and (honestly) regulations.  It's the price I pay for living in the US.