I realise this might be stating the obvious, but I have seen articles out there the Giants can still make the playoffs if they lose to the Jets but win against the cowboys.
For this to happen though, Dallas would have to lose to Philly, who in turn would have to lose to the Redskins.
Is either of these two a given? I would think not.

If the Giants lose on Saturday , and the Cowboys win, thats it, Cowboys win the division. The Giants can finish 8-8 at best, well outside the wild card race.
Should the Giants lose and Cowboys lose their last 2, the Giants Cowboys and Philly(assuming they beat the redskins, which should be automatic for most teams not named the Giants) will end up in a 3way tie at 8-8, with Philly taking the division on a better conference record.
I have spent the last 2 seasons , agonizing over how inconsistent the Giants have been. If in 2008 and 2009 the problem was we took care of business against the weaker teams only to be beaten soundly by better ones.... this time the problem is we seem to drop games to the likes Seattle and Washington.
Just like last year the second game against Dallas , proved to be very expensive, so it looks like this year, the 3 loses against Seattle , Redskins and Philly seem to be impossible to overcome.
I am not entirely despondent, though. Mostly because, I believe this will lead to a change at coach, and a turnover in player personnel. Something thats long overdue..