I've actually changed my view over the last few months. Originally, I was a bit sad when the interest rate was dropped down from 20%.
But now I think an interest rate of around 6-10% would be ideal. It's high enough to keep up with current real world inflation (at least where I am - I appreciate every country is different !). But it's low enough to help reduce Hive inflation.
Most importantly, if the inflation rate is lower, it could encourage more use of HBD for what it is ideal for; a no-fee stablecoin for transactions, not just something to stack and earn interest on.