I agree. Not getting a renewal at this point would be a shock. That 0.8 demo in the 18-49 is fantastic for a 10 pm. slot and as you said, the highest rating for all scripted shows. ABC must be really happy as this is the 4th week in a row of solid Rookie ratings.
For me, this has been a pleasant surprise on Sunday nights. While not the best show, I stay up to watch it. Last time I did this for an ABC show on a Sunday night was for Boston Legal over 15 years ago! Denny Crane!