[michh]

Google has been killing most of its RSS-related products (most notably Reader). People are concerned FeedBurner might be next.

[PavlovsCat]

Yeah, worrying about Feedburner is not new.

http://css-tricks.com/lets-say-feedburner-shuts-down/

This recent NSA stuff may help with motivating people to actually switch, but it's not really needed as a reason.