Interesting points. I suspect that Facebook doesn't allow you to change the name of your business page because of the way they anchor them in their database... but at the same time, I believe you can change your personal page in a way that requires redirecting to a new permanent link. This is the same on twitter or tumblr. On both you can change your name and it will automatically change your personal URL to match. As someone who has had a business page, both of these are complaints that I agree with completely though.