Not really, since that would of course mean a complete rewrite. The code is only as secure as it's authors make it, too - Python or Ruby are not magic bullets against XSS or SQL injection. While it would be fantastic to have WordPress in Python, and for the crufty and backwards bits to be cleaned up, old code that has been tested and audited is surely more secure and bug free than a brand new code base.

really ? Perhaps you are ignoring the fact that with PHP you can be as secure as you can care to be. It's all up to you. But let's not get started on this one. It's done to death already.