If Haye wins his first return fight against the 10th ranked heavyweight (WBA) in style, then a fight against Haye becomes appealing to Fury. No other heavyweight in the division will sell more tickets than Haye (except for possibly Joshua, but Joshua is nowhere near ready to fight Fury).
Haye and Fury don't like each other for well known reasons, but in boxing, money often talks loudest. It would be a Wembley sell out, do well on ppv (domestically, at least), and is a fight that Fury would be confident of winning. I can definitely see it happening.