if its really Open Source, it can't be taken over. If it has a critical mass of users a fork will happen since the source is out there.
Java never has been open source, and thus all things dependent on it like Open Office, never really were either. There are some compatible Open Source java clones, expect interest in them to grow rapidly with this decision by Oracle.
OTOH, I've never liked Java and if died tomorrow I wouldn't cry a single tear.
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