Have more than 10 years of experience in designing, developing and maintaining database systems on diverse platforms such as Oracle, Postgres, MySQL, Mongo, Cassandra, Redis, and SQLServer.
Your question is a valid concern as we all see the rise of NoSQL databases.
But let's get the facts straight first.
Most of the enterprise applications around the world are built upon RDBMS and have some bit and pieces that rely on NoSQL. Most of the web is using RDBMS along with NoSQL.
SQL Databases are not dying as of the next 20 years because most of the applications still rely on the relationship mechanism and will continue to work on it. NoSQL databases are designed to serve a specific purpose where they excel (BigData, rapid reads, low latency inserts, etc...) or we can say they bring the features that traditional RDBMS lacks. So consider SQL Databases are not going anywhere in the near future.
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Your question is a valid concern as we all see the rise of NoSQL databases.
But let's get the facts straight first.
Most of the enterprise applications around the world are built upon RDBMS and have some bit and pieces that rely on NoSQL. Most of the web is using RDBMS along with NoSQL.
SQL Databases are not dying as of the next 20 years because most of the applications still rely on the relationship mechanism and will continue to work on it. NoSQL databases are designed to serve a specific purpose where they excel (BigData, rapid reads, low latency inserts, etc...) or we can say they bring the features that traditional RDBMS lacks. So consider SQL Databases are not going anywhere in the near future.