Probably because we're on the verge of relegation ultimately.
Benitez still had 20+ games to turn things around - If we lose saturday we could be in the bottom 3 with only 8 games left which includes Liverpool, Chelsea, Arsenal & Leicester (2) 3 of those being away ties.
We wont stay up if Lampard can't dig out results look at Wigan under Martinez. We've shipped 9 goals in 3 games to Burnley, Crystal Palace and West Ham and cant score from open play.
I don't want to see another manager sacked but I think the board will be accepting relegashun if they don't do one last roll of the dice and hope for a new manager bounce ala Leeds/someone who can tighten us up.