I've personally seen this, but more so from seeing the corporate site's blogs (usually via marketing or another resource) featured/linked to within the community. However, I think there are many ways to get them to potentially transition to using the blogs within your Jive community. Gamification and creating missions around this would of course be my first suggestion. Making it interesting or fun from a promotion standpoint, not just badges, and creating a theme or call to action is a good way to support the specified mission. The new blog format (if you're on cloud) is also nice because of it's new design and rich banners... much more of a modern blog feel.
If you want to see one in action (they use an HTML widget I believe, but you could also create a custom tile)... VMTurbo has their Virtualization blogs shown on their community landing page that links out to their actual home:
I'd love to hear from others as well.