Oracle will be around for many, many decades to come. Especially since in the enterprise world nobody could care less what engineers thought. Managers determine budgets and capabilities. Architects determine what to purchase and how it fits together. Engineers implement. Pecking order that's been around as long as Oracle has.

The biggest obstacle to Oracle's future success isn't price or other databases. It's the analytics space i.e. Hadoop/Spark which is relegating big iron SQL databases to being dumb CRUD boxes. It's why both Oracle and Teradata moved into the space but have struggled to get any traction against Hortonworks or Cloudera.