Peg at +5%

What do you think of BitShares HERO coin? Its value is pegged to USD +5% per year. I guess if we assume 2% USD inflation, this can only be sustained if shares increase in value by at least 3% per year. They mention transaction fees can be tuned to maintain that 3% growth once the initial expansion phase is over, e.g. by burning shares. We could have a USNBT5, CNNBT5, etc.?

Shareholders are about a day away from approving an initiative to create a currency, XNBT, that will be both more stable than major national currencies while also maintaining its value.