Haye is actually in his prime right now IMO

And it coincides perfectly with the beginning of Vitali's decline

Haye is retired unless Vitali fights him. No one else will generate as much money as Vitali and other than Wladimir he's the only heavyweight that is a big name. Fury and Price won't come near to what a V. Klitschko vs. D. Haye fight would mean or generate in terms of revenue.