Wouldn't expect them to roll over even if they had 4th secured and untouchable by then. Nobody wants to get beat, at home, in the penultimate game of the season. If we win there, it will be because we outplayed them. If they take points of us because they are fighting for a top 4 spot, as someone has already pointed out they will have already taken points off Arsenal too.
Ultimately, it is too far ahead. At 4 poibts behind, we have two must win games coming up to get back to the top of the table. After that is after that.