User blog comment:Bacon is Good/War over Dragonborn/@comment-4870625-20120603093255

Nah, they probably will just have a giant raffle or something...

Although seriously, I think it may be decided on who the Dragonborn either chose to follow first (i.e. Sithis for Dark Brootherhood or Nocturnal for Thieves Guild). Although, this may not be the case. After all, just because you did a favor for a Daedra doesn't mean that you are actually worshipping it. The only things that could affect the Dragonborn's afterlife could be 1. Werewolf- upon death, all werewolves are brought to Hircine's Hunting Grounds to partake in the Wild Hunt. 2. Dark Brotherhood Assassin- due in fact that they go to the Void to serve Sithis in Death. 3 Thieves Guild/Nightingale- basically, you're forced to swear an oath to Nocturnal.

Aside from these three outcomes, there isn't any other "permanent" pacts that I'm aware of. Although, if the Dragonborn is really that worried, then he/she could just become a vampire. Eternal life and ripping off the Daedra? Sounds like a winning strategy to me.