We also play Man U away, and they're not actually far off 4th place. 7 points from Arsenal at the moment isn't much to catch. Everton being 6 points ahead, but they're playing Man City (H) and Southampton (A) before playing Man U in potentially another big deciding game. Plus Man U have goal difference advantage if they catch up on points (Everton's will be 2 or more goals worse for 2 defeats, and Man U 2 goals better for 2 wins)
We've got a game in hand on United as well as a 6 point lead. Even if we blew it, Arsenal would have to implode as well, with Spurs for good measure. United haven't got a prayer of 4th
It already looks like 1 down, 2 to go. I'll grant you it's not the most likely result (especially having seen how ****e Man U are this season) but in the space of a couple of weeks you've got 2 tough games and that head to head with them so it's not completely impossible. Not when Man U's next 4 games are you, and then Norwich, Sunderland, and us at Old Trafford. *Correction to my earlir post, Everton have Palace before the Man U game, the Southampton and Man Ciy games are the ones after the head-to-head, which is better because it means they've still got at least the current gap so the pressure can't have built on them since Man U aren't playing before then.