At a minimum, I'd look for a change so that any re-airings do count in the averages for the week and for the averages on the night they air. But if I had to wager, I'd say the entire scheme gets abandoned entirely. It's too much of an advantage for certain networks/shows that air highly rated shows early in the weekand have really weak Saturdays [i.e. NBC, Heroes, Monday], and a disadvantage for those that air their highly rated shows late in the week [ABC, Extreme Makeover, Desperate Housewives, Brothers & Sisters].
I think this was the case of paper pushers at the networks and/or ad agencies agreeing to these things last year without understanding the implications. Once put into effect, the programmers, first at NBC, saw the obvious opportunity and are using it in a way that was not anticipated.
It's effectively the same way that syndicated ratings have been calculated for a long time, accumulating ratings across multiple airings each week. However, since most syndicated shows air M-F, there wasn't any "gaming" opportunity there.