I know that heroes don't have set fates, but it was implied that Sheogorath in Skyrim is the Hero of Kvatch, and it was mentioned that it was rumored that the Nerevarine went to Akavir. So, what vague thing could they say about the Dragonborn. Here is a cool thing they could say: "I heard that the Last Dragonborn met Nerevarine in their travels, and they went back to Akavir to face Tosh Raka!" "Where did you hear that?" "Some drunk Nord from Skyrim told me! Carried a wierd looking sword around. Don't rememeber what he looking like, still a bit hungover from last night!"
Seriously, we could really get an interesting explenation, and sticking to tradition, there is an MMO based on TES coming out in a week, Neloth from Morrowind is alive and well, apparently choices do not matter and tradition is slowly going out the window.