At the moment, Chuck is in a strange place, chances-wise. On one hand, the ratings have been trending slightly down--unless you include the PVR numbers--despite these episodes being some of the best of the series. On the other hand, the ratings are *that* terrible when compared to the rest of NBC's lineup, and the network is sinking fast. Do you bring back Chuck, just to have *some* viewers, in hopes of shuffling them onto new/similar shows? Or do you can it, and pretty much start the next season's lineup from scratch (excluding a few comedies like Community)?
My guess--and it's only a guess--is that Chuck and Heroes will both be back. NBC will want *something* to market in places like Comicon and the like. Perhaps a new night will be in order though. Wednesdays is looking a little bleak these days...