Oracle will do the same to MySQL as IBM did to Lotus, as Microsoft did to Foxpro, etc. That is, let it die, or worse -- remember that MS released a "new" version of Foxpro after the purchase, and the new version was FUBAR, for the most part, as a result of which Foxpro users were forced to abandon ship.

I don't know how smart Ellison really is, but the last few years of performance by Oracle don't support a belief that he's a marketing genius of any kind. With MySQL gone as a supported freeware (or ebbing away rapidly), Ellison's best course of action, IMHO, would be to release a low-end Oracle DB with a verrrrry smooth MySQL transition wizard included, priced below SQL Server