The continuing fragmentation of the TV marketplace is paying dividends for fans of SFF shows. Some niche shows are being renewed at ratings levels that would have meant sure cancellation just a few years ago.
There's gotta be more to it than that. Dollhouse's ratings aren't marginal, they're downright tragic!

But if this increases the odds of Reaper and Chuck getting renewed, fine by me. Fox would just fill that slot with some cop show anyway. They've got nothing in the hopper that interests me.