One thing to take into consideration is the fact all the rest of the shows are at 10PM Eastern, so we don't know if that will effect the audience rating.
For comparison, here are the ratings (the fast nationals from zap2it) from last week the nights it will be on, both the leader and ABC's:
Monday: CBS led with a 12.3, ABC had an 11.2 (but take that with a grain of salt, because that was the big Mel Gibson interview; the week before, ABC had the last part of a movie end with a 4.4)
Tuesday:NBC led with a 9.6, ABC had a 6.3
Thursday:NBC led with a 14.4, ABC had a 5.6
Friday:NBC led with a 7.8, ABC had a 6.2
So I'd guess if they can get 7.0's or so across the board, we'll see some sort of return in May, or even if it isn't and it's close, they'll probably decide if they went at 9 instead of 10, it would do better. The fact the rating went up in the 2nd half hour is a good sign as well.