The chances of Oracle killing off MySQL is roughly equal to Novell trying to
kill off the Linux kernel.
Which is, of course, zero chance.
Despite what the Postgresql ra-ra brigade may make it seem there are a very
large of people that use Mysql for very important things and there is zero
chance that they will let Oracle or anybody else take it away from them.
Worst case is that they will end up calling it something other then MySQL.