That's a terrible reason to buy a company, it's completely unrelated! You could just as well argue it's a terrible time to buy a struggling company, because the market is likely to drop, so you should have waited until then. The real question is, is this company a good quality company likely to grow in the future? (Or if you are the gambling type, "do I think this stock will go up?") The, secondarily, "is the price reasonable?"
I think it is clear the Boeing is not a good quality company at this time, and the fact that they have a cash-flow problem is not encouraging, since it means they are one step away from bankruptcy restructuring.