Would you want it to be like the Fallout show with a new story, or would you want it to follow one of the games that we already have. If you want a new story and/or setting, where and when would you like it? Me personally would like to see it take place in Elswyr
Probably should do a new filler story far putside the times of the games, and it should depend on budget. Like doing something about Nords coming to Tamriel may be cheaper than say some Oblivion or Apocrypha type of story, or grand scale Eummerset buildings.
From a cost standpoint in terms of set pieces and CGI.