RIM's US marketshare dropped 15% in a year.
canalys.com
canalys.com
EDIT: I wasn't clear. I meant there won't be a Blackberry device in 2013, but I don't think they'll go out of business.
On the other hand if the current legal climate persists, someone could buy RIM for its patents, and in that case Google or Apple - or an Android user - seems more likely since MS has already been able to use its existing portfolio against Android users.