Well, your ticket is good for a year and you're only using 11 of 16 possible segments, including only 2 of 6 allowed in North America. One thing to consider is breaking the trip at LAX on your return, flying to PHX outside the RTW, then use your 6 remaining N.A. segments (but only one remaining stopover) sometime during the next eleven months. There are lots of tier point- or mileage-earning possibilities available in NA, so why throw them away by returning to the point of origin and having the ticket turn into a pumpkin?