It's still Oracle
People aren't so much concerned that Oracle would kill MySQL on purpose (at least not anymore). They're concerned that Oracle would kill it by smothering it with bureaucracy and by holding back features from the open source version to help sales of the proprietary version.
Oracle saying that they don't see Oracle DB and MySQL as competing with each other is missing the point. They're looking for ways to segment the market in order to extract maximum value. Many customers however don't want to be "segmented" in this manner. They do not want to have to worry about what Oracle's sales and marketing department is going to dream up next.
People are looking at Postgres as well as MariaDB. There's also the new and fancy no-sql databases, but Postgres is adding no-sql features and outperforming some of the no-sql database at their own game. There's a lot of new interest in Postgres as a result.