How is this useful? How do I say things that are true,novel,important. Oh well, only say things that you're sure they're 'worth hearing' - where presumably, worth hearing is defined as being true, novel and important.
This seems like quite a solipsistic view of essay writing. If everyone knew how useful their writing was before anyone else read it then the problem he's describing wouldn't exist. No one would choose to publish bad things - the problem is people publish bad things because they don't know they're bad until other people have pointed out why.
All this is really doing is arguing for a bias against publishing - have a high threshold, as a result lots of good ideas will go unpublished, but the few that do get published will make you look good. Is that actually a good solution to provide the most value to the people reading, or is that a good solution to maintain your reputation?