It's an odd thing but lots of Tom fans seem to prefer the "he's earned his peace - let him go" scenario. I think that's why there are no Bring Back the Boy fics. I feel, too, that this fandom has a fierce respect for canon which tends to dissuade those with smaller egos than mine from attempting dodgy epics which mess with the tradition. That said, given the scripts they've had in series 3 and 4, canon clearly isn't an over-weening consideration for the show's writers, so why we should bother respecting it...