Instead they're trying to undercut Google by keeping them out of the 'shared data' agreement and now they're going into... e-mail and messaging? I'd rather they work on improving Facebook Connect and give me a way to control my data (and usable privacy controls while we're at it). I sure as hell don't want my personal email (and even less any business or corporate email) going through Facebook. Hell I have a hard time accepting Gmail, though it's so convenient I compromise.
Lots of people say that Facebook won't go the way of MySpace. But you know what? Lots of people said the same thing about MySpace too. Everyday I see or hear more and more about people I know just not using their accounts anymore and in some cases actually deleting them; even I don't get much value from it either this days.
I think Facebook is losing direction and just trying to wow users with amazing features that no one really needs. They need to focusing on making what they have better, not adding features and avoiding integration with other services.