BigData and NoSQL are the choice for database solutions nowadays, but that does not mean the crucial features of RDBMS will die. Since 90% of the world data produced in last some years, therefore the need for RDBMS will not end in the near future.
The RDBMS market is incrementing with 9% annual growth, as stated by Gartner, a research company. RDBMS is meant to handle organized data. NoSQL and Big Data maybe a preferred choice, but the importance of RDBMS will not end in near future.
Managing data on a large scale now needs technologies like Big Data, but RDBMS still servers the purpose of fast and secure data management.
Many users still work on RDBMS; therefore, it still has the edge. With that, not every organization can afford the costly Big Data. Huge enterprises with a lot of budget can easily prefer Big Data. However, small and medium enterprises would still rather work with RDBMS.