Chances are Liverpool and/or Arsenal will take some points of Chelsea between them.
I think Cahill alluded to that in his after match interview stating that the 3 points against Hull were extremely important to maintain and have as good a buffer with a few tough games coming up.
There's no doubt that Chelsea could drop some points over those tough games or even after, but by the same token Arsenal, Spurs and/or L'pool don't have it in them to go unbeaten the remainder of the season either! It's one thing reducing a points gap when teams at the top play each other and another expecting the team at the top to lose to much lesser positioned clubs whilst those in the hunt go unbeaten!