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You can use vanillicon for other uses. Just don't ddos us :)
I'm going to echo Lincoln and say that we have absolutely no plans whatsoever to support another relational DB in house, but that doesn't mean that someone else can't support it.
If we move to support another database it will be a NoSQL style database and it will be to support our own hosting efforts.
MySQL is GPL which means that it's impossible for it to die. If Oracle decides to stop supporting MySQL then there are a lot of other companies that will including the bigs like Google and Facebook that already contribute to the project.
In addition, there are the branches like MariaDB and Percona (which we use).
So if MySQL dies it will be because of something like a zombipocalypse and I recommend getting off of forums and defending yourself in that case.
Man, that's just not advisable. Let's look at this scenario.
I swing my longsword at that orc (role: 1), uh oh...
I try and punch myself in the face (role: 1), hurray!