Still waiting for proof developers are not happy.
I'm not saying you are wrong, but there could be any number of reasons that no-one would go publicly / on record about not being happy with a PS4K and mid-gen spec bumps in general.
If you are from a larger third party studio, you probably like your job and wouldn't want to endanger it Adam Orth style by saying something that they will absolutely let you be the fall guy for.
If you are from a studio closer to Sony and you guys do know about PS4K etc already, there is no way you aren't under NDA etc. Especially as the console hasn't even been announced yet.
If you are from an indie or smaller studio, you probably don't know enough to say anything or if you do have that knowledge from Sony for some reason - there is no way you would want to damage that relationship etc.
So again, I'm not saying you are wrong - but people tend to like keeping their jobs/income/prospects open. There are legit reasons for people to not be going on record for now.