What Is the Future of Databases?

Our answer to the author's question, "is there a way to unify the interface across systems?" is to double-down on Postgres and in particular Foreign Data Wrappers for Elastic, Redis, and Neo4j and Postgres triggers/functions to keep the data in sync.

As the author pointed out, Postgres is a battle-tested and great option, and for us it's our company's source of truth for all data. However, there are definitely use-cases where using elastic or neo4j to look at our data in a different light are very helpful.

IMO Postgres is one of the top-5 software projects of all time, I don't feel like I'm making a bad choice by further grokking it.