I think that Manning could be a top 3 pick in 2014, and here's why.
Manning put up 16% more points (406) than any other player in 2013 (Standard ESPN Scoring). Manning also scored 61% more points than the 10th ranked QB.
Compare that to the #1 ranked RB last year, Jamaal Charles, who scored 12.6% more points than the #2 ranked RB, and 69% more points than the 10th ranked RB.
The marginal difference between the #1 ranked QB and the 10th ranked QB was nearly identical to the top ranked RB vs the 10th ranked RB. Given the fact that Manning outscored every other player by 16% would indicate that he is worthy of a #1 pick in most formats.