It depends. If you use GReader to read 10 RSS, you can move to FB/Twitter/Mail newsletter.
If, like you or me, use GReader to read 200 feeds, you will find an alternative that suits your needs. Or code it, be it a full RSS parser, or just a greasemonkey addon to change feedly appearance.
Because you care about reading your news, one way or another.
Edit: one thing is special in this case: GReader users are more "power users" than usual. So we are not talking about TMZ site going down. That's why I think that people who really care will try to find an alternative.
I suspect any real competitor in the rss space will provide an instant import via the zip of bookmarks / feeds / etc soon anyway.
I'm just worried about an Android app that can fill Readers roll. I use it for reading webcomics since I can swipe left or right to move through my subscriptions, which is much more efficient than any other means to browse them on mobile.
If, like you or me, use GReader to read 200 feeds, you will find an alternative that suits your needs. Or code it, be it a full RSS parser, or just a greasemonkey addon to change feedly appearance.
Because you care about reading your news, one way or another.
Edit: one thing is special in this case: GReader users are more "power users" than usual. So we are not talking about TMZ site going down. That's why I think that people who really care will try to find an alternative.