If you are interested in selling your unit when they do begin resales you need to cal the resale dept now and get your name on the waiting list of owners interested in selling. Marriott does keep such a list. I am willing to bet that when you call them you will be shocked at the number of people who are ahead of you on the list.
I know that when I called about selling my Barony Beach there were over 250 people ahead of me on the list who were interested in selling. Some of these will change their mind or have sold privately before their name reaches the top of the list but it took almost 3 years for my name to reach the top of the list so it certainly would not hurt to get your name on the list now. you can always change your mind when they contact you to have you sign the listing agreement.