The part where it sounds too good to be true is a good and new point raised.
On my witness node I lowered from 18% (which I was voting before) to 16% exactly because I also still believe in increasing the HBD supply and I also believe that HBD is great for attracting new users, but you're completely right that it hasn't been working so great and probably because people do think that it is too good to be true
I don't think these changes will impact any prices, they may just upset a few people that were expecting yields to stay high and profit odf of it, which I hope they do, but in the end Hive should be about HIVE
Hopefully curation improves in the future with the yield adjusted