Don't worry Ruthie. It is almost impossible for Andy not to qualify. The lower ranked players will have to gain sufficient points (SF (360), F (600) or win (1000)) in the coming MS to overtake Andy and push him down from 4th to 9th.
The fact that they are lower ranked is precisely the reason why this won't happen. Maybe two or three might (e.g. Roddick or Ferrer) but not all 5 players below him ! Also, someone in the top 8 tends to get injured around this time and pulls out (e.g. Davydenko) which lets in the 9th ranked person.
In the worst possible scenario that Andy doesn't qualify, he will gain 1 extra week of rest to train and prepare with his new coach for the AO. It is a win/win situation