man this is truly awesome and the Versa by far is the cheapest car to own. I hope I have the same situation as you with my Versa. I usually do one pad change then on the next just put on new rotors. I never measure the thickness or anything but I think with the V I will!
My car only has 52k miles so far and the only thing showing any signs of wear is the tires. I have the 1.6 so I pray they used same quality parts.
I to will be running this car until the very end. Resale pretty much blows so driving it until it dies is the best way to get your monies worth. Once it's paid off it will have about 150k miles (I drive alot). To go another 150k or so with out major repairs or problems would be phenomenal