Eh, I think that would unfairly penalize people who are away for that one particular week, and would also place a much greater burden on the Speaker's office. As it stands, Elu's set up some nice helpful scripts that keep us notified when people fail to meet the requirements - forcing a manual PM message and manual tracking of everyone who responds would be frustrating, as well as take up a huge amount of PM space (~70 PMs at least once a month, whereas in comparison right now I get maaaaaybe one a month).