Database Support Other Than MySQL

I have been researching database systems recently and have found that of all the free, open source alternatives that MySQL is years behind PostgreSQL and is even lagging its fork MariaDB. Both database systems are forging ahead with new features that will not appear in MySQL for years to come, if ever.

cPanel is now supporting MariaDB and web hosts are starting to move to it away from MySQL (cPanel also supports PostgreSQL). As of now, the MariaDB 5.x branch is a drop-in replacement for MySQL. But that is not true of the MariaDB 10 branch. As time goes on, I would expect there to be more divergence between MariaDB and MySQL.

I know this topic has been discussed a lot in the past. I was curious as to if there has been any more recent discussion on the topic of supporting other database systems by WordPress developers as it seems the importance of MySQL is diminishing and will continue to diminish.