A few follow up points to think about
- If you don't roll over will you travel enough make PM in 2017?
- What is your reserve spend? Will you make 25k? Can you possibly make 60k? (you don't have to answer this on the forum) As you know 60k is the magical number because then you get the full 30k in MQM's. I'm guessing you can at least get to 25k because you the amount of travel you do.
- Are you rock solid in your job and can you predict the travel you will be doing in 2017 and 2018? Companies can scale back and do virtual meetings or if you change jobs your roll over plan can end up getting screwed up.
- Are your S America airports upgradeable travel or no?
All in all Id prob go for DM to get the bene's and because you cannot predict the future.