Hi Matt, first thanks for getting the time to read my post, and replay.
The problem I still see is that even if you have your domain the link is messed up.
From your blog.
http://feeds.mattcutts.com/~r/mattcutts/uJBW/~3/8IurStR5fXw/
Goes to
http://www.mattcutts.com/blog/pubcon-2012-slides/
So if I bookmark the former, and FB dissapear you will have to create a full list of 301 redirects in your server so my links still work. Yes you have the control, but that is a lot of work.
Why not make FB links like this?
http://feeds.mattcutts.com/blog/pubcon-2012-slides/
In that case all you have to do is a 301 of feeds to www.
Hope my point is clear.
Edit: never mind. Someone found this http://www.wangarific.com/how-to-get-rid-of-feedproxy-links-...
That way you really have all the control back.
If I recall correctly, as an independent company Feedburner charged a modest fee for CNAME feeds.
Once Google acquired Feedburner, Google made the feature free.
I'm pretty sure the consumer got a nice win here.
Here's more info: http://support.google.com/feedburner/answer/79590?hl=en
The short version is that FeedBurner has a free feature called MyBrand which serves your feeds from a CNAME of your own domain. Then if you choose to leave FeedBurner, you still have full control of your feeds and permalinks. I set it up on my own domain years ago as feeds.mattcutts.com, for example.
I think this free feature of FeedBurner is one that everyone should use so that you keep feeds under your own control and served off your own domain.