This makes sense and honestly I couldn't even understand why it's been at 20% for as long as it has been. It undervalues hive itself since you only make a 7%-11% APR while do working (aka curation) the negative of that however is the risk that hive changes in price and does so rather rapidly.
Now HBD does a pretty good job at holding it's value at $1 but there's legit no work to be done to get that 20% APR.
I'm honestly all for slow reduction down of APR on HBD to something more around the 5% - 7% level.
The reason for that is HBD requires pretty much zero work so 5%-7% a little lower APR with lower risk seems reasonable compared to a riskier HIVE APR that puts out around 7% - 11% (I get this percent from general powered up APR and maxing out your curation on average)
RE: gtg witness update, upcoming changes in HBD APR