Maybe the proposal above by itself isn't enough, but it's going to solve some of the many problems that put a restriction on max allowable connections in the first place. For example, I am not sure if there is anything in there to reduce the baseline per connection memory consumption, but maybe that will come up as the next problem to solve and will hopefully be solved sooner than later.
Today's news is about PostgreSQL 12 GA release. The news you may have seen recently was about few Beta releases in last few months and an RC release last week.
https://www.postgresql.org/docs/current/libpq-pipeline-mode....