I have some pretty mixed feelings on this subject, I had just brought it up a few threads ago after committing my first code into the whiteboard area.
On the one hand we need to think about legacy code and having to update so many projects that use the current namespaces. This alone makes me want to NOT rename all of the current namespaces. I also like the short length of the current namespace since it starts with simply "spark...". At the same time I feel like moving the namespace to "org.apache.flex..." would be a bold statement that would let the rest of the development world that does not follow what is happening around Flex as closely know that the project is officially in the hands of The ASF and out of Adobe's. I've also thought that perhaps doing such a move would be best for Flex.next, as opposed to the current 4.x branch. I think that if it were up to me and I had the final say I'd probably vote for keeping the current namespace in the 4.x branch and moving the namespace in the future for Flex.next. -omar