To make HBD useful it needs a bigger supply. The 20% lead to a few hundred k of HBD being printed per year. In relation to the rewards the chain gives out as well as to total marketcap that's nothing. We also have safeguards in place (haircut) to not end up in a death spiral like Luna.
I would say there's no need to worry about this, the situation is being monitored and we will react promptly when market conditions make it necessary.