I guess not that busy...
That site really doesn't know what it's talking about. The Cancellation Bear (from TVByTheNumbers) has Elementary as a certain renewal, not even close to being cancelled. http://tvbythenumbers.zap2it.com/2013/03/12/cbs-golden-boy-vegas-are-certain-to-be-canceled-but-the-3rd-drama-canceled-isnt-so-certain/172823/
CBS will most likely cancel Golden Boy, Vegas and probably CSI:NY. CBS usually cancels 3 dramas a season. To get to Elementary they would not only need to cancel the previous 3 but also the Good Wife and the Mentalist before getting to Elementary.
Not saying it couldn't happen but I'd be pretty confident in Elementary being picked up for another season.