Turnaround would be a bitch, and definately put both teams at a disadvantage, as well as any other teams waiting to plan based on the outcome.
What I think they should do: Treat it as a tie. It will put the Bills likely as the #2 seed and probably hand the North to the Bengals, but the Bills are going to have a hard enough time preparing for Sunday, much less a possible 3 games in the next week and a half. You can't ask that of them, especially depending on Hamlin's progress in that time.
What I think they will do: Delay deciding until after this weekend's games. Then, depending on how much impact the outcome would have, they'll talk to the teams about finishing it Tuesday or Wednesday.