MySQL is in danger of dying slowly.
If this happens, anyone running a blog on wordpress and lot of other web and non web applications are going to be in trouble. No more frequent updates, no more in time bug fixes, no more development, possibly higher prices for commercial licenses.
Here's the cause: Oracle is trying to buy Sun and since Sun bough MySQL last year, Oracle is going to end up owning MySQL.
Why is this bad for MySQL?
Well basically Oracle doesn't have any interest in promoting and developing this database server when they already have one that makes them more money. By buying MySQL Oracle eliminates the competition and everybody knows where there's no competition Bad Things Happen TM.
You can read more about the story and also find out how you can help with this on this post: Help Saving MySQL from the creator of MySQL.