Or the price of oil could drop further.
Or the price of oil could go back up.
Or the airlines could reduce flights because people aren't booking, so there would be fewer seats available and prices would rise.
You're in the same situation as ever: Get a sense of what is a reasonably good price for your route and season, and when you can get that, go ahead and book, then don't obsess about it. No matter what you do, somebody on the flight is going to have paid much less than you, and somebody is going to have paid more.