I can't see Chelsea falling away. They have a very strong bench from an attacking perspective (if you exclude Torres) and irrespective of form have way more match winners than we have. They are playing below par at the moment but could easily win almost all of their remaining matches if they found a bit of consistency.
All I know is we need to remove Everton from the list of variables. We must beat them in my opinion. A draw is not good enough.
They have been falling away though, over the last 6 games they are in 10th position in the table, with 3 losses against Saudi Sportswashing Machine, Southampton, and Emirates Marketing Project.
Their form apart from the first 8-10 games has been very poor and I can't see it improving with their upcoming schedule. They probably have the toughest run in out of us, Arsenal, and themselves, still having to go to Anfield and Old Trafford and playing us at home. Also Fulham and Villa away, and Everton and Swansea at home will be tough games for them. I definitely can't see them getting 15 points in their next 8 games which they would need to reach 70.
Arsenal have an easy run in and will definitely finish in the top 4 imo, so it is Chelsea we must finish above.