Usenet suffers from two problems: 1. Network effects and 2. Paywall.
Usenet used to be where it was at for conversation on the Internet. Then it moved. Getting people to go back to Usenet is probably going to be as hard as spinning up a Facebook competitor. You want to go where people are.
Secondly, Usenet used to be bundled into your internet package along with some basic email hosting and maybe some website hosting. But then the binaries groups exploded and a lot of the ISPs dropped support. So you have to go out and buy a separate package for access now.