A stable currency make the economic system stronger, because it could be used as more reliable intrument to be used as a transaction means.

It doesnt matter, because this experiment isnt acually achieving anything.

You can read more about it here:

https://steempeak.com/sbdpotato/@phgnomo/how-sbd-peg-actually-works-or-how-the-sbdpotato-conversions-won-t-affect-sbd-price