Re: The 90's dream of an Unified Unix is slowly materializing
Yes, if you do need a simple RDBMS database with no add on features it's pretty hard to make a case against postgres. Increasingly new applications will move away from SQL Server etc, and it will be left with stuff that's built around its SSIS, or BI addons, or systems like Dynamics. SQL Server HA functionality is now excellent but it still needs a strong business case to justify. Same for Oracle, it will be sustained by its Applications or business systems like JDEdwards, but 95% of Oracle database only deployments could have been on Postgre.
If you are a DBA or DB developer on Oracle or SQL then make sure you get Maria and PostgreSQL under your hat and keep an eye on nosqls like Mongo too.
On Azure a lot of DBA work is automated. By a lot I mean most.