FliteGirl -
VB have already been doing that since we had the B738's. This is a seperate exemption that allows the -800 to be crewed with 4 crew and a full pax load (189 pax, which includes 9 infants), however the way the exemption is worded relates specifically to the B737-800 only - it makes no mention of changing the CC to Pax ratio across the board... although I am sure that won't be far off