Mueller knows nothing about the Oracle market
The comments about customers switching from Oracle to MySQL speak of a complete lack of data and/or knowledge of the market. My old company surveyed a large number of people switching from Oracle a couple of years ago, and, if they were switching, it was to Postgres, not MySQL. In fact, we found more people switching from MySQL to Oracle than any other movement between proprietary and open source.
Mueller may have been an 'adviser' to MySQL, but I've done open source strategy for a huge number of companies in the last eight years, from startups to Global 50's. None of them have ever been interested in moving from Oracle to MySQL. Oracle to Postgres, maybe, esp. with EnterpriseDB's Oracle emulation, but even that was a stretch. Most people will not switch from Oracle because the risk is too high and there is not enough MySQL talent available to mitigate that risk or maintain production systems.