Cabrera, IMO, showed a decent bat yesterday, just unlucky. He hit a couple on the screws, but right at someone. Defensively, he looked really, really slow.
He has some value, in that he's a replacement level player at a position that's difficult to man. Janish can't hit, has never hit, and likely won't hit now, so depending on him strikes me as a ridiculous notion. Though his glove is supremely awesome, he'd an offensive black hole.